diff --git a/CHANGELOG.md b/CHANGELOG.md
index a9bd6f2..adeec9f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,37 @@ Format angelehnt an [Keep a Changelog](https://keepachangelog.com/de/1.0.0/).
 
 ## [Unreleased]
 
+### 🎼 Songtext, Warteschlange, Sperrbildschirm-Cover und gleiche Lautstärke (2026-08-20)
+- 📝 **Automatischer Songtext:** Beim Scan wird der Songtext aus dem Tag der
+  Datei mitgelesen und in der Wiedergabe sofort angezeigt — **ohne Server und
+  ohne Internet**. Nur wenn die Datei keinen Text enthält, wird der
+  Navidrome-Server gefragt.
+  🐛 Nebenbei gefixt: Der Songtext-Knopf hat bisher die Datei-Adresse statt der
+  Song-ID weitergegeben, dadurch kam vom Server nie ein Text zurück.
+- ➕ **Warteschlange ohne Nebenwirkungen:** Im ⋮-Menü einer Songzeile gibt es
+  jetzt **"Als Nächstes spielen"** und **"Zur Warteschlange hinzufügen"** —
+  beides ändert **nichts** an Favoriten oder Wiedergabelisten und
+  unterbricht die laufende Wiedergabe nicht. Umgekehrt entfernt das
+  ✕ in der Warteschlange den Titel weiterhin nur dort — er bleibt Favorit
+  und bleibt in jeder Wiedergabeliste.
+- 🖼️ **Sperrbildschirm zeigt dasselbe Bild wie die App:** Läuft ein Titel,
+  bekommt der Sperrbildschirm jetzt das **Kategorie-Cover** (sofern die
+  Einstellung "Gleiche Kategorie = gleiches Coverbild" an ist) statt eines
+  abweichenden Bildes. Auch Wiedergabelisten zeigen jetzt dieses Cover.
+- 🔉 **Gleiche Lautstärke (ReplayGain):** Neuer Schalter unter *Einstellungen →
+  Ton* (standardmäßig an). Melo liest den ReplayGain-Tag der Datei und
+  **senkt laute Titel ab**, damit alles gleich laut wirkt.
+  ⚠️ **Ehrlich dazugesagt:** Verstärken kann ein Player nicht über 100 %
+  hinaus — angeglichen wird deshalb immer nach unten. Und es funktioniert
+  nur bei Dateien, die den Tag mitbringen (typisch FLAC/OGG und mit
+  ReplayGain versehene MP3s). Dateien ohne Tag bleiben unverändert.
+- 🔧 **Details:**
+  - DB-Schema 6: neue Spalten `lyrics` und `gain_db`.
+  - Neu: `player/replay_gain.dart` (7 Tests), `playNextIndex` +
+    `addToQueue`/`playNext` im Audio-Handler (3 Tests),
+    Cover-Vorgabe in `songToMediaItem` (3 Tests).
+- ✅ **Getestet:** 154 Tests grün, `flutter analyze` ohne Befund.
+
 ### 🎚️ Equalizer, Dolby Atmos und automatische Wiedergabe (2026-08-20)
 - ✅ **Was:** Die Einstellungen haben einen neuen Bereich **Ton** mit
   Equalizer, Dolby Atmos und der automatischen Wiedergabe bei Kopfhörern.
diff --git a/lib/library/database.dart b/lib/library/database.dart
index 29b197b..7a78201 100644
--- a/lib/library/database.dart
+++ b/lib/library/database.dart
@@ -30,6 +30,14 @@ class Songs extends Table {
   /// ein erneuter Scan sie nicht mehr mit dem Genre-Tag der Datei.
   BoolColumn get categoriesEdited => boolean().withDefault(const Constant(false))();
 
+  /// Songtext aus dem Tag der Datei — Grundlage für den automatischen
+  /// Songtext ohne Server.
+  TextColumn get lyrics => text().nullable()();
+
+  /// ReplayGain des Titels in Dezibel, sofern die Datei den Tag mitbringt —
+  /// Grundlage für "Gleiche Lautstärke".
+  RealColumn get gainDb => real().nullable()();
+
   @override
   Set<Column> get primaryKey => {id};
 }
@@ -112,7 +120,7 @@ class MeloDb extends _$MeloDb {
   MeloDb([QueryExecutor? executor]) : super(executor ?? _open());
 
   @override
-  int get schemaVersion => 4;
+  int get schemaVersion => 6;
 
   @override
   MigrationStrategy get migration => MigrationStrategy(
@@ -131,6 +139,12 @@ class MeloDb extends _$MeloDb {
             await m.addColumn(songs, songs.categoriesEdited);
             await m.createTable(songCategories);
           }
+          if (from < 5) {
+            await m.addColumn(songs, songs.lyrics);
+          }
+          if (from < 6) {
+            await m.addColumn(songs, songs.gainDb);
+          }
         },
       );
 
@@ -324,6 +338,14 @@ class MeloDb extends _$MeloDb {
     return query.watch().map((rows) => rows.map((r) => r.readTable(songs)).toList());
   }
 
+  /// Songtext eines Songs, sofern beim Scan einer im Tag gefunden wurde.
+  Future<String?> lyricsOf(String songId) async {
+    final row = await (select(songs)..where((s) => s.id.equals(songId)))
+        .getSingleOrNull();
+    final text = row?.lyrics?.trim();
+    return (text == null || text.isEmpty) ? null : text;
+  }
+
   // === Kategorien ===
   /// Alle Kategorien-Zuordnungen, nach Song gebündelt und in gespeicherter
   /// Reihenfolge — die UI braucht sie immer für die ganze sichtbare Liste.
diff --git a/lib/library/database.g.dart b/lib/library/database.g.dart
index 57871c4..1eea1fd 100644
--- a/lib/library/database.g.dart
+++ b/lib/library/database.g.dart
@@ -140,6 +140,24 @@ class $SongsTable extends Songs with TableInfo<$SongsTable, Song> {
     ),
     defaultValue: const Constant(false),
   );
+  static const VerificationMeta _lyricsMeta = const VerificationMeta('lyrics');
+  @override
+  late final GeneratedColumn<String> lyrics = GeneratedColumn<String>(
+    'lyrics',
+    aliasedName,
+    true,
+    type: DriftSqlType.string,
+    requiredDuringInsert: false,
+  );
+  static const VerificationMeta _gainDbMeta = const VerificationMeta('gainDb');
+  @override
+  late final GeneratedColumn<double> gainDb = GeneratedColumn<double>(
+    'gain_db',
+    aliasedName,
+    true,
+    type: DriftSqlType.double,
+    requiredDuringInsert: false,
+  );
   @override
   List<GeneratedColumn> get $columns => [
     id,
@@ -154,6 +172,8 @@ class $SongsTable extends Songs with TableInfo<$SongsTable, Song> {
     deleted,
     playCount,
     categoriesEdited,
+    lyrics,
+    gainDb,
   ];
   @override
   String get aliasedName => _alias ?? actualTableName;
@@ -255,6 +275,18 @@ class $SongsTable extends Songs with TableInfo<$SongsTable, Song> {
         ),
       );
     }
+    if (data.containsKey('lyrics')) {
+      context.handle(
+        _lyricsMeta,
+        lyrics.isAcceptableOrUnknown(data['lyrics']!, _lyricsMeta),
+      );
+    }
+    if (data.containsKey('gain_db')) {
+      context.handle(
+        _gainDbMeta,
+        gainDb.isAcceptableOrUnknown(data['gain_db']!, _gainDbMeta),
+      );
+    }
     return context;
   }
 
@@ -312,6 +344,14 @@ class $SongsTable extends Songs with TableInfo<$SongsTable, Song> {
         DriftSqlType.bool,
         data['${effectivePrefix}categories_edited'],
       )!,
+      lyrics: attachedDatabase.typeMapping.read(
+        DriftSqlType.string,
+        data['${effectivePrefix}lyrics'],
+      ),
+      gainDb: attachedDatabase.typeMapping.read(
+        DriftSqlType.double,
+        data['${effectivePrefix}gain_db'],
+      ),
     );
   }
 
@@ -340,6 +380,14 @@ class Song extends DataClass implements Insertable<Song> {
   /// Sobald die Kategorien eines Songs von Hand geändert wurden, überschreibt
   /// ein erneuter Scan sie nicht mehr mit dem Genre-Tag der Datei.
   final bool categoriesEdited;
+
+  /// Songtext aus dem Tag der Datei — Grundlage für den automatischen
+  /// Songtext ohne Server.
+  final String? lyrics;
+
+  /// ReplayGain des Titels in Dezibel, sofern die Datei den Tag mitbringt —
+  /// Grundlage für "Gleiche Lautstärke".
+  final double? gainDb;
   const Song({
     required this.id,
     required this.path,
@@ -353,6 +401,8 @@ class Song extends DataClass implements Insertable<Song> {
     required this.deleted,
     required this.playCount,
     required this.categoriesEdited,
+    this.lyrics,
+    this.gainDb,
   });
   @override
   Map<String, Expression> toColumns(bool nullToAbsent) {
@@ -377,6 +427,12 @@ class Song extends DataClass implements Insertable<Song> {
     map['deleted'] = Variable<bool>(deleted);
     map['play_count'] = Variable<int>(playCount);
     map['categories_edited'] = Variable<bool>(categoriesEdited);
+    if (!nullToAbsent || lyrics != null) {
+      map['lyrics'] = Variable<String>(lyrics);
+    }
+    if (!nullToAbsent || gainDb != null) {
+      map['gain_db'] = Variable<double>(gainDb);
+    }
     return map;
   }
 
@@ -402,6 +458,12 @@ class Song extends DataClass implements Insertable<Song> {
       deleted: Value(deleted),
       playCount: Value(playCount),
       categoriesEdited: Value(categoriesEdited),
+      lyrics: lyrics == null && nullToAbsent
+          ? const Value.absent()
+          : Value(lyrics),
+      gainDb: gainDb == null && nullToAbsent
+          ? const Value.absent()
+          : Value(gainDb),
     );
   }
 
@@ -423,6 +485,8 @@ class Song extends DataClass implements Insertable<Song> {
       deleted: serializer.fromJson<bool>(json['deleted']),
       playCount: serializer.fromJson<int>(json['playCount']),
       categoriesEdited: serializer.fromJson<bool>(json['categoriesEdited']),
+      lyrics: serializer.fromJson<String?>(json['lyrics']),
+      gainDb: serializer.fromJson<double?>(json['gainDb']),
     );
   }
   @override
@@ -441,6 +505,8 @@ class Song extends DataClass implements Insertable<Song> {
       'deleted': serializer.toJson<bool>(deleted),
       'playCount': serializer.toJson<int>(playCount),
       'categoriesEdited': serializer.toJson<bool>(categoriesEdited),
+      'lyrics': serializer.toJson<String?>(lyrics),
+      'gainDb': serializer.toJson<double?>(gainDb),
     };
   }
 
@@ -457,6 +523,8 @@ class Song extends DataClass implements Insertable<Song> {
     bool? deleted,
     int? playCount,
     bool? categoriesEdited,
+    Value<String?> lyrics = const Value.absent(),
+    Value<double?> gainDb = const Value.absent(),
   }) => Song(
     id: id ?? this.id,
     path: path ?? this.path,
@@ -470,6 +538,8 @@ class Song extends DataClass implements Insertable<Song> {
     deleted: deleted ?? this.deleted,
     playCount: playCount ?? this.playCount,
     categoriesEdited: categoriesEdited ?? this.categoriesEdited,
+    lyrics: lyrics.present ? lyrics.value : this.lyrics,
+    gainDb: gainDb.present ? gainDb.value : this.gainDb,
   );
   Song copyWithCompanion(SongsCompanion data) {
     return Song(
@@ -493,6 +563,8 @@ class Song extends DataClass implements Insertable<Song> {
       categoriesEdited: data.categoriesEdited.present
           ? data.categoriesEdited.value
           : this.categoriesEdited,
+      lyrics: data.lyrics.present ? data.lyrics.value : this.lyrics,
+      gainDb: data.gainDb.present ? data.gainDb.value : this.gainDb,
     );
   }
 
@@ -510,7 +582,9 @@ class Song extends DataClass implements Insertable<Song> {
           ..write('updatedAtMs: $updatedAtMs, ')
           ..write('deleted: $deleted, ')
           ..write('playCount: $playCount, ')
-          ..write('categoriesEdited: $categoriesEdited')
+          ..write('categoriesEdited: $categoriesEdited, ')
+          ..write('lyrics: $lyrics, ')
+          ..write('gainDb: $gainDb')
           ..write(')'))
         .toString();
   }
@@ -529,6 +603,8 @@ class Song extends DataClass implements Insertable<Song> {
     deleted,
     playCount,
     categoriesEdited,
+    lyrics,
+    gainDb,
   );
   @override
   bool operator ==(Object other) =>
@@ -545,7 +621,9 @@ class Song extends DataClass implements Insertable<Song> {
           other.updatedAtMs == this.updatedAtMs &&
           other.deleted == this.deleted &&
           other.playCount == this.playCount &&
-          other.categoriesEdited == this.categoriesEdited);
+          other.categoriesEdited == this.categoriesEdited &&
+          other.lyrics == this.lyrics &&
+          other.gainDb == this.gainDb);
 }
 
 class SongsCompanion extends UpdateCompanion<Song> {
@@ -561,6 +639,8 @@ class SongsCompanion extends UpdateCompanion<Song> {
   final Value<bool> deleted;
   final Value<int> playCount;
   final Value<bool> categoriesEdited;
+  final Value<String?> lyrics;
+  final Value<double?> gainDb;
   final Value<int> rowid;
   const SongsCompanion({
     this.id = const Value.absent(),
@@ -575,6 +655,8 @@ class SongsCompanion extends UpdateCompanion<Song> {
     this.deleted = const Value.absent(),
     this.playCount = const Value.absent(),
     this.categoriesEdited = const Value.absent(),
+    this.lyrics = const Value.absent(),
+    this.gainDb = const Value.absent(),
     this.rowid = const Value.absent(),
   });
   SongsCompanion.insert({
@@ -590,6 +672,8 @@ class SongsCompanion extends UpdateCompanion<Song> {
     this.deleted = const Value.absent(),
     this.playCount = const Value.absent(),
     this.categoriesEdited = const Value.absent(),
+    this.lyrics = const Value.absent(),
+    this.gainDb = const Value.absent(),
     this.rowid = const Value.absent(),
   }) : id = Value(id),
        path = Value(path),
@@ -609,6 +693,8 @@ class SongsCompanion extends UpdateCompanion<Song> {
     Expression<bool>? deleted,
     Expression<int>? playCount,
     Expression<bool>? categoriesEdited,
+    Expression<String>? lyrics,
+    Expression<double>? gainDb,
     Expression<int>? rowid,
   }) {
     return RawValuesInsertable({
@@ -624,6 +710,8 @@ class SongsCompanion extends UpdateCompanion<Song> {
       if (deleted != null) 'deleted': deleted,
       if (playCount != null) 'play_count': playCount,
       if (categoriesEdited != null) 'categories_edited': categoriesEdited,
+      if (lyrics != null) 'lyrics': lyrics,
+      if (gainDb != null) 'gain_db': gainDb,
       if (rowid != null) 'rowid': rowid,
     });
   }
@@ -641,6 +729,8 @@ class SongsCompanion extends UpdateCompanion<Song> {
     Value<bool>? deleted,
     Value<int>? playCount,
     Value<bool>? categoriesEdited,
+    Value<String?>? lyrics,
+    Value<double?>? gainDb,
     Value<int>? rowid,
   }) {
     return SongsCompanion(
@@ -656,6 +746,8 @@ class SongsCompanion extends UpdateCompanion<Song> {
       deleted: deleted ?? this.deleted,
       playCount: playCount ?? this.playCount,
       categoriesEdited: categoriesEdited ?? this.categoriesEdited,
+      lyrics: lyrics ?? this.lyrics,
+      gainDb: gainDb ?? this.gainDb,
       rowid: rowid ?? this.rowid,
     );
   }
@@ -699,6 +791,12 @@ class SongsCompanion extends UpdateCompanion<Song> {
     if (categoriesEdited.present) {
       map['categories_edited'] = Variable<bool>(categoriesEdited.value);
     }
+    if (lyrics.present) {
+      map['lyrics'] = Variable<String>(lyrics.value);
+    }
+    if (gainDb.present) {
+      map['gain_db'] = Variable<double>(gainDb.value);
+    }
     if (rowid.present) {
       map['rowid'] = Variable<int>(rowid.value);
     }
@@ -720,6 +818,8 @@ class SongsCompanion extends UpdateCompanion<Song> {
           ..write('deleted: $deleted, ')
           ..write('playCount: $playCount, ')
           ..write('categoriesEdited: $categoriesEdited, ')
+          ..write('lyrics: $lyrics, ')
+          ..write('gainDb: $gainDb, ')
           ..write('rowid: $rowid')
           ..write(')'))
         .toString();
@@ -2598,6 +2698,8 @@ typedef $$SongsTableCreateCompanionBuilder =
       Value<bool> deleted,
       Value<int> playCount,
       Value<bool> categoriesEdited,
+      Value<String?> lyrics,
+      Value<double?> gainDb,
       Value<int> rowid,
     });
 typedef $$SongsTableUpdateCompanionBuilder =
@@ -2614,6 +2716,8 @@ typedef $$SongsTableUpdateCompanionBuilder =
       Value<bool> deleted,
       Value<int> playCount,
       Value<bool> categoriesEdited,
+      Value<String?> lyrics,
+      Value<double?> gainDb,
       Value<int> rowid,
     });
 
@@ -2764,6 +2868,16 @@ class $$SongsTableFilterComposer extends Composer<_$MeloDb, $SongsTable> {
     builder: (column) => ColumnFilters(column),
   );
 
+  ColumnFilters<String> get lyrics => $composableBuilder(
+    column: $table.lyrics,
+    builder: (column) => ColumnFilters(column),
+  );
+
+  ColumnFilters<double> get gainDb => $composableBuilder(
+    column: $table.gainDb,
+    builder: (column) => ColumnFilters(column),
+  );
+
   Expression<bool> playlistSongsRefs(
     Expression<bool> Function($$PlaylistSongsTableFilterComposer f) f,
   ) {
@@ -2932,6 +3046,16 @@ class $$SongsTableOrderingComposer extends Composer<_$MeloDb, $SongsTable> {
     column: $table.categoriesEdited,
     builder: (column) => ColumnOrderings(column),
   );
+
+  ColumnOrderings<String> get lyrics => $composableBuilder(
+    column: $table.lyrics,
+    builder: (column) => ColumnOrderings(column),
+  );
+
+  ColumnOrderings<double> get gainDb => $composableBuilder(
+    column: $table.gainDb,
+    builder: (column) => ColumnOrderings(column),
+  );
 }
 
 class $$SongsTableAnnotationComposer extends Composer<_$MeloDb, $SongsTable> {
@@ -2986,6 +3110,12 @@ class $$SongsTableAnnotationComposer extends Composer<_$MeloDb, $SongsTable> {
     builder: (column) => column,
   );
 
+  GeneratedColumn<String> get lyrics =>
+      $composableBuilder(column: $table.lyrics, builder: (column) => column);
+
+  GeneratedColumn<double> get gainDb =>
+      $composableBuilder(column: $table.gainDb, builder: (column) => column);
+
   Expression<T> playlistSongsRefs<T extends Object>(
     Expression<T> Function($$PlaylistSongsTableAnnotationComposer a) f,
   ) {
@@ -3132,6 +3262,8 @@ class $$SongsTableTableManager
                 Value<bool> deleted = const Value.absent(),
                 Value<int> playCount = const Value.absent(),
                 Value<bool> categoriesEdited = const Value.absent(),
+                Value<String?> lyrics = const Value.absent(),
+                Value<double?> gainDb = const Value.absent(),
                 Value<int> rowid = const Value.absent(),
               }) => SongsCompanion(
                 id: id,
@@ -3146,6 +3278,8 @@ class $$SongsTableTableManager
                 deleted: deleted,
                 playCount: playCount,
                 categoriesEdited: categoriesEdited,
+                lyrics: lyrics,
+                gainDb: gainDb,
                 rowid: rowid,
               ),
           createCompanionCallback:
@@ -3162,6 +3296,8 @@ class $$SongsTableTableManager
                 Value<bool> deleted = const Value.absent(),
                 Value<int> playCount = const Value.absent(),
                 Value<bool> categoriesEdited = const Value.absent(),
+                Value<String?> lyrics = const Value.absent(),
+                Value<double?> gainDb = const Value.absent(),
                 Value<int> rowid = const Value.absent(),
               }) => SongsCompanion.insert(
                 id: id,
@@ -3176,6 +3312,8 @@ class $$SongsTableTableManager
                 deleted: deleted,
                 playCount: playCount,
                 categoriesEdited: categoriesEdited,
+                lyrics: lyrics,
+                gainDb: gainDb,
                 rowid: rowid,
               ),
           withReferenceMapper: (p0) => p0
diff --git a/lib/library/scan_service.dart b/lib/library/scan_service.dart
index 1cab331..c3c7fa7 100644
--- a/lib/library/scan_service.dart
+++ b/lib/library/scan_service.dart
@@ -6,6 +6,7 @@ import 'package:path/path.dart' as p;
 import 'package:path_provider/path_provider.dart';
 import 'package:uuid/uuid.dart';
 
+import '../player/replay_gain.dart';
 import 'categories.dart';
 import 'database.dart';
 
@@ -64,6 +65,11 @@ Future<int> scanFolders(
       // Unlesbare/kaputte Tags: Datei trotzdem mit Dateinamen aufnehmen.
     }
 
+    // ReplayGain steht je nach Format an unterschiedlicher Stelle und ist im
+    // vereinheitlichten AudioMetadata nicht enthalten — daher der zweite,
+    // gezielte Blick in die Roh-Tags.
+    final gainDb = _readGain(file);
+
     final rawTitle = meta?.title?.trim();
     final title = (rawTitle != null && rawTitle.isNotEmpty)
         ? rawTitle
@@ -92,6 +98,8 @@ Future<int> scanFolders(
       dateAddedMs: prev?.dateAddedMs ?? now,
       updatedAtMs: now,
       deleted: const Value(false),
+      lyrics: Value(meta?.lyrics),
+      gainDb: Value(gainDb),
     ));
     if (prev?.categoriesEdited != true) {
       categories[id] = parseCategoryList(meta?.genres ?? const []);
@@ -111,3 +119,25 @@ Future<int> scanFolders(
   }
   return companions.length;
 }
+
+/// Liest den ReplayGain-Wert des Titels aus den Roh-Tags: bei FLAC/OGG aus
+/// dem Vorbis-Kommentar, bei MP3 aus einem TXXX-Feld. Fehlt der Tag oder
+/// lässt sich die Datei nicht lesen, gibt es keine Angleichung.
+double? _readGain(File file) {
+  try {
+    final tags = readAllMetadata(file, getImage: false);
+    if (tags is VorbisMetadata) {
+      return parseReplayGain(tags.replayGainTrackGain.firstOrNull);
+    }
+    if (tags is Mp3Metadata) {
+      for (final entry in tags.customMetadata.entries) {
+        if (entry.key.toLowerCase() == 'replaygain_track_gain') {
+          return parseReplayGain(entry.value);
+        }
+      }
+    }
+  } catch (_) {
+    // Kein ReplayGain ist kein Fehler — dann bleibt die Lautstärke wie sie ist.
+  }
+  return null;
+}
diff --git a/lib/library/song_list.dart b/lib/library/song_list.dart
index 3a80c27..ffb8ec2 100644
--- a/lib/library/song_list.dart
+++ b/lib/library/song_list.dart
@@ -1,3 +1,4 @@
+import 'package:audio_service/audio_service.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -83,6 +84,15 @@ class SongList extends StatelessWidget {
 
   /// Menü hinter dem Drei-Punkte-Symbol einer Songzeile.
   Future<void> _showMenu(BuildContext context, Song song) async {
+    final handler = context.read<MeloAudioHandler>();
+    final categories = context.read<CategoryService>();
+    final settings = context.read<AppSettings>();
+    final messenger = ScaffoldMessenger.of(context);
+    MediaItem item() => songToMediaItem(
+          song,
+          cover: categories.coverFor(song,
+              groupByCategory: settings.groupCoversByCategory),
+        );
     await showModalBottomSheet(
       context: context,
       builder: (sheetContext) => SafeArea(
@@ -97,6 +107,28 @@ class SongList extends StatelessWidget {
                 SongDetailSheet.show(context, song);
               },
             ),
+            ListTile(
+              leading: const Icon(Icons.playlist_play),
+              title: const Text('Als Nächstes spielen'),
+              onTap: () async {
+                Navigator.pop(sheetContext);
+                await handler.playNext(item());
+                messenger.showSnackBar(const SnackBar(
+                    content: Text('Läuft als Nächstes')));
+              },
+            ),
+            ListTile(
+              leading: const Icon(Icons.queue),
+              title: const Text('Zur Warteschlange hinzufügen'),
+              subtitle: const Text(
+                  'Nur für jetzt — nicht in Favoriten oder Wiedergabelisten'),
+              onTap: () async {
+                Navigator.pop(sheetContext);
+                await handler.addToQueue(item());
+                messenger.showSnackBar(const SnackBar(
+                    content: Text('Zur Warteschlange hinzugefügt')));
+              },
+            ),
             ListTile(
               leading: const Icon(Icons.playlist_add),
               title: const Text('Zu Wiedergabeliste hinzufügen'),
@@ -147,7 +179,13 @@ class SongList extends StatelessWidget {
           ),
           onTap: () async {
             try {
-              await playSongs(handler, songs, i);
+              await playSongs(
+                handler,
+                songs,
+                i,
+                coverOf: (song) => categories.coverFor(song,
+                    groupByCategory: settings.groupCoversByCategory),
+              );
             } catch (e) {
               if (context.mounted) {
                 ScaffoldMessenger.of(context).showSnackBar(
diff --git a/lib/library/song_media.dart b/lib/library/song_media.dart
index b92d319..d3724db 100644
--- a/lib/library/song_media.dart
+++ b/lib/library/song_media.dart
@@ -3,20 +3,32 @@ import 'package:audio_service/audio_service.dart';
 import '../player/audio_handler.dart';
 import 'database.dart';
 
-MediaItem songToMediaItem(Song s) => MediaItem(
-      id: Uri.file(s.path).toString(),
-      title: s.title,
-      artist: s.artist,
-      album: s.album,
-      duration: s.durationMs != null ? Duration(milliseconds: s.durationMs!) : null,
-      artUri: s.coverPath != null ? Uri.file(s.coverPath!) : null,
-      extras: {'songId': s.id},
-    );
+/// [cover] überschreibt das Coverbild des Songs — damit auf Sperrbildschirm
+/// und in der Benachrichtigung dasselbe Bild erscheint wie in der App
+/// (Einstellung "Gleiche Kategorie = gleiches Coverbild").
+MediaItem songToMediaItem(Song s, {String? cover}) {
+  final art = cover ?? s.coverPath;
+  return MediaItem(
+    id: Uri.file(s.path).toString(),
+    title: s.title,
+    artist: s.artist,
+    album: s.album,
+    duration: s.durationMs != null ? Duration(milliseconds: s.durationMs!) : null,
+    artUri: art != null ? Uri.file(art) : null,
+    extras: {'songId': s.id, 'gainDb': s.gainDb},
+  );
+}
 
-/// Spielt [songs] ab [startIndex] ab.
-Future<void> playSongs(MeloAudioHandler handler, List<Song> songs, int startIndex) {
+/// Spielt [songs] ab [startIndex] ab. [coverOf] liefert je Song das
+/// anzuzeigende Cover (siehe [songToMediaItem]).
+Future<void> playSongs(
+  MeloAudioHandler handler,
+  List<Song> songs,
+  int startIndex, {
+  String? Function(Song)? coverOf,
+}) {
   return handler.loadPlaylist(
-    songs.map(songToMediaItem).toList(),
+    [for (final s in songs) songToMediaItem(s, cover: coverOf?.call(s))],
     startIndex: startIndex,
   );
 }
diff --git a/lib/main.dart b/lib/main.dart
index 6e77b0f..9c46d03 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -54,10 +54,13 @@ Future<void> main() async {
   _handler.androidAudioSessionIdStream.listen((id) {
     if (id != null) _effects.attach(id);
   });
-  _handler.autoPlayOnHeadphones = _settings.autoPlayOnHeadphones;
-  _settings.addListener(
-    () => _handler.autoPlayOnHeadphones = _settings.autoPlayOnHeadphones,
-  );
+  void uebernehmeEinstellungen() {
+    _handler.autoPlayOnHeadphones = _settings.autoPlayOnHeadphones;
+    _handler.normalizeVolume = _settings.normalizeVolume;
+  }
+
+  uebernehmeEinstellungen();
+  _settings.addListener(uebernehmeEinstellungen);
 
   runApp(const MeloApp());
 }
diff --git a/lib/player/audio_handler.dart b/lib/player/audio_handler.dart
index 412654c..092f23e 100644
--- a/lib/player/audio_handler.dart
+++ b/lib/player/audio_handler.dart
@@ -7,6 +7,7 @@ import '../library/database.dart';
 import '../services/cache_manager.dart';
 import '../services/navidrome_service.dart';
 import 'headphone_autoplay.dart';
+import 'replay_gain.dart';
 import 'sleep_timer.dart';
 
 /// Entscheidet, ob eine gespeicherte Wiedergabeposition beim Laden
@@ -28,6 +29,13 @@ bool shouldResumeAt(int lastPositionMs, Duration? trackDuration) {
 bool shouldCountPlay(int? newIndex, int? lastCountedIndex) =>
     newIndex != null && newIndex != lastCountedIndex;
 
+/// Stelle, an der ein Titel eingefügt wird, damit er als Nächstes läuft:
+/// direkt hinter dem laufenden. Läuft nichts, kommt er ans Ende.
+int playNextIndex({required int? currentIndex, required int queueLength}) {
+  if (currentIndex == null) return queueLength;
+  return (currentIndex + 1).clamp(0, queueLength);
+}
+
 /// Kern der Wiedergabe: kapselt just_audio hinter audio_service,
 /// damit Hintergrund-Wiedergabe + Lockscreen/Notification funktionieren.
 class MeloAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandler {
@@ -43,6 +51,10 @@ class MeloAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandler {
   /// Wird von den App-Einstellungen gesetzt.
   bool autoPlayOnHeadphones = false;
 
+  /// Alle Titel auf eine ähnliche Lautstärke bringen (ReplayGain).
+  /// Wird von den App-Einstellungen gesetzt.
+  bool normalizeVolume = true;
+
   MeloAudioHandler({required this.db}) {
     _cache = CacheManager();
     _cache.init();
@@ -69,6 +81,7 @@ class MeloAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandler {
       final q = queue.value;
       if (index != null && index < q.length) {
         mediaItem.add(q[index].copyWith(duration: _player.duration));
+        _applyGain(q[index]);
         if (shouldCountPlay(index, _lastCountedIndex)) {
           _lastCountedIndex = index;
           final songId = q[index].extras?['songId'] as String?;
@@ -88,6 +101,13 @@ class MeloAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandler {
     });
   }
 
+  /// Gleicht die Lautstärke des Titels an. Ohne ReplayGain-Tag oder bei
+  /// abgeschalteter Einstellung bleibt sie unverändert.
+  void _applyGain(MediaItem item) {
+    final gain = item.extras?['gainDb'] as double?;
+    _player.setVolume(normalizeVolume ? volumeForGain(gain) : 1.0);
+  }
+
   /// Startet die Wiedergabe, wenn Kopfhörer verbunden werden und der Nutzer
   /// das in den Einstellungen erlaubt hat.
   Future<void> _watchHeadphones() async {
@@ -163,6 +183,26 @@ class MeloAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandler {
     await play();
   }
 
+  /// Hängt [item] hinten an die Warteschlange an, ohne die laufende
+  /// Wiedergabe zu unterbrechen. Favoriten und Wiedergabelisten bleiben
+  /// unberührt — die Warteschlange ist nur für diese Sitzung.
+  Future<void> addToQueue(MediaItem item) async {
+    await _player.addAudioSource(AudioSource.uri(Uri.parse(item.id), tag: item));
+    queue.add([...queue.value, item]);
+  }
+
+  /// Spielt [item] als Nächstes, direkt nach dem laufenden Titel.
+  Future<void> playNext(MediaItem item) async {
+    final index = playNextIndex(
+      currentIndex: _player.currentIndex,
+      queueLength: queue.value.length,
+    );
+    await _player.insertAudioSource(
+        index, AudioSource.uri(Uri.parse(item.id), tag: item));
+    final updated = [...queue.value]..insert(index, item);
+    queue.add(updated);
+  }
+
   @override
   Future<void> play() => _player.play();
 
diff --git a/lib/player/now_playing_screen.dart b/lib/player/now_playing_screen.dart
index c63b798..0782dcc 100644
--- a/lib/player/now_playing_screen.dart
+++ b/lib/player/now_playing_screen.dart
@@ -2,6 +2,7 @@ import 'package:audio_service/audio_service.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
+import '../library/database.dart';
 import '../services/navidrome_service.dart';
 import '../shared/cover.dart';
 import '../shared/favorite_button.dart';
@@ -36,9 +37,10 @@ class NowPlayingScreen extends StatelessWidget {
                 mainAxisSize: MainAxisSize.min,
                 children: [
                   IconButton(
-                    tooltip: 'Lyrics',
+                    tooltip: 'Songtext',
                     icon: const Icon(Icons.lyrics),
-                    onPressed: () => _showLyrics(context, item.id),
+                    onPressed: () => _showLyrics(
+                        context, item.extras?['songId'] as String? ?? item.id),
                   ),
                   FavoriteButton(songId: item.extras?['songId'] as String? ?? ''),
                 ],
@@ -314,26 +316,36 @@ class _LyricsSheet extends StatefulWidget {
 
 class _LyricsSheetState extends State<_LyricsSheet> {
   late final NavidromeService _nav = NavidromeService();
-  Lyrics? _lyrics;
+  String? _text;
   bool _loading = true;
 
   @override
   void initState() {
     super.initState();
-    _nav.ladeGespeicherteZugangsdaten().then((_) {
-      if (_nav.istVerbunden) {
-        _nav.getLyrics(widget.songId).then((lyrics) {
-          if (mounted) {
-            setState(() {
-              _lyrics = lyrics;
-              _loading = false;
-            });
-          }
+    _load();
+  }
+
+  /// Zuerst der Songtext aus dem Tag der Datei — der ist sofort da und
+  /// funktioniert offline. Nur wenn keiner drinsteht, wird der Server gefragt.
+  Future<void> _load() async {
+    final db = context.read<MeloDb>();
+    final lokal = await db.lyricsOf(widget.songId);
+    if (lokal != null) {
+      if (mounted) setState(() { _text = lokal; _loading = false; });
+      return;
+    }
+    await _nav.ladeGespeicherteZugangsdaten();
+    if (_nav.istVerbunden) {
+      final lyrics = await _nav.getLyrics(widget.songId);
+      if (mounted) {
+        setState(() {
+          _text = lyrics.isEmpty ? null : lyrics.text;
+          _loading = false;
         });
-      } else {
-        setState(() => _loading = false);
       }
-    });
+      return;
+    }
+    if (mounted) setState(() => _loading = false);
   }
 
   @override
@@ -347,7 +359,7 @@ class _LyricsSheetState extends State<_LyricsSheet> {
             child: Row(
               mainAxisAlignment: MainAxisAlignment.spaceBetween,
               children: [
-                const Text('📝 Lyrics',
+                const Text('📝 Songtext',
                     style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600)),
                 IconButton(
                   icon: const Icon(Icons.close),
@@ -361,15 +373,15 @@ class _LyricsSheetState extends State<_LyricsSheet> {
                 ? const Center(
                     child: CircularProgressIndicator(color: MeloTheme.red),
                   )
-                : _lyrics?.isEmpty ?? true
+                : _text == null
                     ? const Center(
-                        child: Text('Keine Lyrics verfügbar',
+                        child: Text('Kein Songtext verfügbar',
                             style: TextStyle(color: Colors.white54)),
                       )
                     : SingleChildScrollView(
                         padding: const EdgeInsets.all(16),
                         child: Text(
-                          _lyrics?.text ?? '',
+                          _text!,
                           style: const TextStyle(
                             fontSize: 14,
                             height: 1.6,
diff --git a/lib/player/replay_gain.dart b/lib/player/replay_gain.dart
new file mode 100644
index 0000000..9c35c68
--- /dev/null
+++ b/lib/player/replay_gain.dart
@@ -0,0 +1,20 @@
+import 'dart:math' as math;
+
+/// Liest einen ReplayGain-Wert aus einem Tag wie "-6.54 dB".
+/// Gibt null zurück, wenn im Tag nichts Brauchbares steht.
+double? parseReplayGain(String? raw) {
+  if (raw == null) return null;
+  final match = RegExp(r'-?\+?\d+(\.\d+)?').firstMatch(raw.trim());
+  if (match == null) return null;
+  return double.tryParse(match.group(0)!.replaceFirst('+', ''));
+}
+
+/// Rechnet eine ReplayGain-Angabe in Dezibel in einen Lautstärkefaktor um.
+///
+/// Angeglichen wird ausschließlich **nach unten**: laute Titel werden leiser
+/// gemacht. Über 100 % hinaus kann der Player nicht verstärken, deshalb
+/// bleiben Titel mit positivem Wert unverändert.
+double volumeForGain(double? gainDb) {
+  if (gainDb == null || gainDb >= 0) return 1.0;
+  return math.pow(10, gainDb / 20).toDouble().clamp(0.0, 1.0);
+}
diff --git a/lib/playlists/playlist_detail_screen.dart b/lib/playlists/playlist_detail_screen.dart
index 5fd022c..19616c5 100644
--- a/lib/playlists/playlist_detail_screen.dart
+++ b/lib/playlists/playlist_detail_screen.dart
@@ -1,10 +1,12 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
+import '../library/category_service.dart';
 import '../library/database.dart';
 import '../library/playlist_service.dart';
 import '../library/song_media.dart';
 import '../player/audio_handler.dart';
+import '../settings/app_settings.dart';
 import '../shared/cover.dart';
 
 /// Playlist-Detailansicht: Songs anzeigen, per Drag & Drop umsortieren, entfernen.
@@ -17,6 +19,8 @@ class PlaylistDetailScreen extends StatelessWidget {
     final db = context.read<MeloDb>();
     final handler = context.read<MeloAudioHandler>();
     final service = context.read<PlaylistService>();
+    final categories = context.watch<CategoryService>();
+    final settings = context.watch<AppSettings>();
     return Scaffold(
       appBar: AppBar(title: Text(playlist.name)),
       body: StreamBuilder<List<Song>>(
@@ -47,11 +51,15 @@ class PlaylistDetailScreen extends StatelessWidget {
               final s = songs[i];
               return ListTile(
                 key: ValueKey(s.id),
-                leading: CoverImage(
-                  artUri: s.coverPath != null ? Uri.file(s.coverPath!) : null,
-                  size: 48,
-                  radius: 6,
-                ),
+                leading: Builder(builder: (context) {
+                  final cover = categories.coverFor(s,
+                      groupByCategory: settings.groupCoversByCategory);
+                  return CoverImage(
+                    artUri: cover != null ? Uri.file(cover) : null,
+                    size: 48,
+                    radius: 6,
+                  );
+                }),
                 title: Text(s.title, maxLines: 1, overflow: TextOverflow.ellipsis),
                 subtitle: Text(s.artist ?? 'Unbekannt',
                     maxLines: 1, overflow: TextOverflow.ellipsis),
@@ -62,7 +70,13 @@ class PlaylistDetailScreen extends StatelessWidget {
                 ),
                 onTap: () async {
                   try {
-                    await playSongs(handler, songs, i);
+                    await playSongs(
+                      handler,
+                      songs,
+                      i,
+                      coverOf: (song) => categories.coverFor(song,
+                          groupByCategory: settings.groupCoversByCategory),
+                    );
                   } catch (e) {
                     if (context.mounted) {
                       ScaffoldMessenger.of(context).showSnackBar(
diff --git a/lib/settings/app_settings.dart b/lib/settings/app_settings.dart
index 9aca760..7137d44 100644
--- a/lib/settings/app_settings.dart
+++ b/lib/settings/app_settings.dart
@@ -6,9 +6,11 @@ import 'package:shared_preferences/shared_preferences.dart';
 class AppSettings extends ChangeNotifier {
   static const _keyGroupCovers = 'gleiche_kategorie_gleiches_cover';
   static const _keyAutoPlayHeadphones = 'autoplay_kopfhoerer';
+  static const _keyNormalizeVolume = 'gleiche_lautstaerke';
 
   bool _groupCoversByCategory = true;
   bool _autoPlayOnHeadphones = false;
+  bool _normalizeVolume = true;
 
   /// "Gleiche Kategorie = gleiches Coverbild" — an: das Cover kommt von der
   /// ersten Kategorie des Songs, aus: jeder Song zeigt sein eigenes Bild.
@@ -17,10 +19,15 @@ class AppSettings extends ChangeNotifier {
   /// Wiedergabe automatisch starten, sobald Kopfhörer verbunden werden.
   bool get autoPlayOnHeadphones => _autoPlayOnHeadphones;
 
+  /// "Gleiche Lautstärke": laute Titel werden anhand ihres ReplayGain-Tags
+  /// auf das Niveau der leiseren abgesenkt.
+  bool get normalizeVolume => _normalizeVolume;
+
   Future<void> init() async {
     final prefs = await SharedPreferences.getInstance();
     _groupCoversByCategory = prefs.getBool(_keyGroupCovers) ?? true;
     _autoPlayOnHeadphones = prefs.getBool(_keyAutoPlayHeadphones) ?? false;
+    _normalizeVolume = prefs.getBool(_keyNormalizeVolume) ?? true;
     notifyListeners();
   }
 
@@ -32,6 +39,14 @@ class AppSettings extends ChangeNotifier {
     await prefs.setBool(_keyGroupCovers, value);
   }
 
+  Future<void> setNormalizeVolume(bool value) async {
+    if (_normalizeVolume == value) return;
+    _normalizeVolume = value;
+    notifyListeners();
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool(_keyNormalizeVolume, value);
+  }
+
   Future<void> setAutoPlayOnHeadphones(bool value) async {
     if (_autoPlayOnHeadphones == value) return;
     _autoPlayOnHeadphones = value;
diff --git a/lib/settings/settings_screen.dart b/lib/settings/settings_screen.dart
index 234fad5..127032a 100644
--- a/lib/settings/settings_screen.dart
+++ b/lib/settings/settings_screen.dart
@@ -123,6 +123,16 @@ class _SettingsScreenState extends State<SettingsScreen> {
             trailing: const Icon(Icons.open_in_new),
             onTap: () => _oeffneSystemKlangeffekte(context),
           ),
+          Consumer<AppSettings>(
+            builder: (context, settings, _) => SwitchListTile(
+              secondary: const Icon(Icons.equalizer),
+              title: const Text('Gleiche Lautstärke'),
+              subtitle: const Text(
+                  'Senkt laute Titel ab (nur bei Dateien mit ReplayGain-Tag)'),
+              value: settings.normalizeVolume,
+              onChanged: settings.setNormalizeVolume,
+            ),
+          ),
           Consumer<AppSettings>(
             builder: (context, settings, _) => SwitchListTile(
               secondary: const Icon(Icons.headset),
diff --git a/lib/shared/sortable_song_list.dart b/lib/shared/sortable_song_list.dart
index d656d34..36cd495 100644
--- a/lib/shared/sortable_song_list.dart
+++ b/lib/shared/sortable_song_list.dart
@@ -4,8 +4,10 @@ import 'package:provider/provider.dart';
 import '../library/database.dart';
 import '../library/song_list.dart';
 import '../library/song_media.dart';
+import '../library/category_service.dart';
 import '../library/song_sort.dart';
 import '../player/audio_handler.dart';
+import '../settings/app_settings.dart';
 import 'sort_store.dart';
 import 'theme.dart';
 
@@ -47,10 +49,18 @@ class _SortableSongListState extends State<SortableSongList> {
   Future<void> _shuffle() async {
     if (widget.songs.isEmpty) return;
     final handler = context.read<MeloAudioHandler>();
+    final categories = context.read<CategoryService>();
+    final settings = context.read<AppSettings>();
     final messenger = ScaffoldMessenger.of(context);
     final shuffled = [...widget.songs]..shuffle();
     try {
-      await playSongs(handler, shuffled, 0);
+      await playSongs(
+        handler,
+        shuffled,
+        0,
+        coverOf: (song) => categories.coverFor(song,
+            groupByCategory: settings.groupCoversByCategory),
+      );
     } catch (e) {
       messenger.showSnackBar(
         SnackBar(content: Text('Wiedergabe fehlgeschlagen: $e')),
diff --git a/test/library/song_media_test.dart b/test/library/song_media_test.dart
index 1f48057..b635586 100644
--- a/test/library/song_media_test.dart
+++ b/test/library/song_media_test.dart
@@ -2,6 +2,18 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:melo/library/database.dart';
 import 'package:melo/library/song_media.dart';
 
+Song _song({String? coverPath}) => Song(
+      id: 'song-1',
+      path: '/a.mp3',
+      title: 'A',
+      coverPath: coverPath,
+      dateAddedMs: 0,
+      updatedAtMs: 0,
+      deleted: false,
+      playCount: 0,
+      categoriesEdited: false,
+    );
+
 void main() {
   test('songToMediaItem trägt die Song-UUID in extras', () {
     final song = Song(
@@ -23,4 +35,22 @@ void main() {
 
     expect(item.extras?['songId'], song.id);
   });
+
+  test('ohne Cover-Vorgabe gilt das eigene Cover des Songs', () {
+    final item = songToMediaItem(_song(coverPath: '/eigen.img'));
+
+    expect(item.artUri, Uri.file('/eigen.img'));
+  });
+
+  test('Cover-Vorgabe (z. B. aus der Kategorie) gewinnt — auch auf dem '
+      'Sperrbildschirm', () {
+    final item =
+        songToMediaItem(_song(coverPath: '/eigen.img'), cover: '/kategorie.img');
+
+    expect(item.artUri, Uri.file('/kategorie.img'));
+  });
+
+  test('ohne jedes Cover bleibt artUri leer', () {
+    expect(songToMediaItem(_song()).artUri, isNull);
+  });
 }
diff --git a/test/player/queue_insert_test.dart b/test/player/queue_insert_test.dart
new file mode 100644
index 0000000..ac5302e
--- /dev/null
+++ b/test/player/queue_insert_test.dart
@@ -0,0 +1,20 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:melo/player/audio_handler.dart';
+
+void main() {
+  group('playNextIndex', () {
+    test('fügt direkt hinter dem laufenden Titel ein', () {
+      expect(playNextIndex(currentIndex: 0, queueLength: 3), 1);
+      expect(playNextIndex(currentIndex: 2, queueLength: 5), 3);
+    });
+
+    test('hängt ans Ende, wenn der letzte Titel läuft', () {
+      expect(playNextIndex(currentIndex: 2, queueLength: 3), 3);
+    });
+
+    test('hängt ans Ende, wenn nichts läuft', () {
+      expect(playNextIndex(currentIndex: null, queueLength: 4), 4);
+      expect(playNextIndex(currentIndex: null, queueLength: 0), 0);
+    });
+  });
+}
diff --git a/test/player/replay_gain_test.dart b/test/player/replay_gain_test.dart
new file mode 100644
index 0000000..98bee07
--- /dev/null
+++ b/test/player/replay_gain_test.dart
@@ -0,0 +1,43 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:melo/player/replay_gain.dart';
+
+void main() {
+  group('parseReplayGain', () {
+    test('liest das übliche Tag-Format', () {
+      expect(parseReplayGain('-6.54 dB'), closeTo(-6.54, 0.001));
+      expect(parseReplayGain('+2.30 dB'), closeTo(2.30, 0.001));
+      expect(parseReplayGain('-8.120000 dB'), closeTo(-8.12, 0.001));
+    });
+
+    test('kommt auch ohne Einheit zurecht', () {
+      expect(parseReplayGain('-3.2'), closeTo(-3.2, 0.001));
+    });
+
+    test('ignoriert unbrauchbare Werte', () {
+      expect(parseReplayGain(null), isNull);
+      expect(parseReplayGain(''), isNull);
+      expect(parseReplayGain('keine Ahnung'), isNull);
+    });
+  });
+
+  group('volumeForGain', () {
+    test('ohne Wert bleibt die Lautstärke unverändert', () {
+      expect(volumeForGain(null), 1.0);
+    });
+
+    test('negative Verstärkung senkt die Lautstärke ab', () {
+      // -6 dB entspricht ungefähr der halben Amplitude.
+      expect(volumeForGain(-6), closeTo(0.501, 0.005));
+      expect(volumeForGain(-20), closeTo(0.1, 0.005));
+    });
+
+    test('positive Verstärkung bleibt bei voller Lautstärke', () {
+      // Lauter als 100 % geht nicht — angeglichen wird nach unten.
+      expect(volumeForGain(6), 1.0);
+    });
+
+    test('sehr starke Absenkung bleibt hörbar', () {
+      expect(volumeForGain(-60), greaterThan(0.0));
+    });
+  });
+}