diff --git a/lib/screens/now_playing_screen.dart b/lib/screens/now_playing_screen.dart
index d61f91d8..5ca5ef3d 100644
--- a/lib/screens/now_playing_screen.dart
+++ b/lib/screens/now_playing_screen.dart
@@ -3855,6 +3855,15 @@ TextAlign _lyricTextAlign(BuildContext context, LyricLine line) {
     return context.isMornye ? TextAlign.start : TextAlign.center;
   }
   if (voice.isGroup) return TextAlign.left;
+  // Provider declarations can be missing or ordered by first appearance.
+  // The standard V labels retain their meaning regardless of that order.
+  switch (voice.id.toLowerCase()) {
+    case 'v1':
+    case 'v3':
+      return TextAlign.left;
+    case 'v2':
+      return TextAlign.right;
+  }
   return voice.index.isEven ? TextAlign.left : TextAlign.right;
 }
 
diff --git a/lib/utils/lyrics_parser.dart b/lib/utils/lyrics_parser.dart
index 84b2e6d3..44a783f6 100644
--- a/lib/utils/lyrics_parser.dart
+++ b/lib/utils/lyrics_parser.dart
@@ -111,7 +111,7 @@ class LyricsParser {
         match.end,
         match.group(1)!.replaceAll(RegExp(r'\s+'), ''),
       ),
-      LyricVoice(id: id, index: (number ?? 1) - 1),
+      LyricVoice(id: id, index: (number ?? 1) - 1, isGroup: id == 'v3'),
     );
   }
 
@@ -525,7 +525,8 @@ class LyricsParser {
           namespaceUri: 'http://www.w3.org/XML/1998/namespace',
         );
         if (id == null || id.isEmpty) continue;
-        final group = agent.getAttribute('type') == 'group';
+        final group =
+            agent.getAttribute('type') == 'group' || id.toLowerCase() == 'v3';
         voices[id] = LyricVoice(id: id, index: individualIndex, isGroup: group);
         if (!group) individualIndex++;
       }
@@ -538,7 +539,11 @@ class LyricsParser {
         if (id == null || id.isEmpty) return inherited;
         return voices.putIfAbsent(
           id,
-          () => LyricVoice(id: id, index: individualIndex++),
+          () => LyricVoice(
+            id: id,
+            index: individualIndex++,
+            isGroup: id.toLowerCase() == 'v3',
+          ),
         );
       }
 
diff --git a/rust_backend/crates/core/src/lyrics/payloads.rs b/rust_backend/crates/core/src/lyrics/payloads.rs
index d6bfd38b..1bc8eb98 100644
--- a/rust_backend/crates/core/src/lyrics/payloads.rs
+++ b/rust_backend/crates/core/src/lyrics/payloads.rs
@@ -80,17 +80,36 @@ fn apple_vocal_sides(text: &str, payload: &ApplePayload) -> String {
     let mut voices = BTreeMap::new();
     let mut person = 0;
     for agent in agents {
-        let voice = match agent.kind.as_str() {
-            "person" => {
+        let voice = match (agent.id.to_ascii_lowercase().as_str(), agent.kind.as_str()) {
+            ("v1", _) | ("v3", _) | (_, "group") => 1,
+            ("v2", _) => {
+                person = person.max(2);
+                2
+            }
+            (_, "person") => {
                 person += 1;
                 person
             }
-            "group" => 1,
             _ => continue,
         };
+        if agent.id.eq_ignore_ascii_case("v1") {
+            person = person.max(1);
+        }
         voices.insert(agent.id.as_str(), format!("v{voice}"));
     }
     let lines = payload.content.as_deref().unwrap_or_default();
+    // A proxy may omit agent declarations but retain standard IDs on lines.
+    // Correct oppositeTurn before it turns a V3 collaboration into V2.
+    for line in lines {
+        let voice = match line.agent.to_ascii_lowercase().as_str() {
+            "v1" | "v3" => "v1",
+            "v2" => "v2",
+            _ => continue,
+        };
+        voices
+            .entry(line.agent.as_str())
+            .or_insert_with(|| voice.into());
+    }
     if voices.is_empty() || lines.is_empty() {
         return text.into();
     }
@@ -600,6 +619,29 @@ mod supplement_tests {
         );
     }
 
+    #[test]
+    fn apple_v3_does_not_depend_on_agent_order_or_group_metadata() {
+        for agents in [
+            serde_json::Value::Null,
+            serde_json::json!([
+                {"id": "v1", "type": "person"},
+                {"id": "v3", "type": "person"},
+                {"id": "v2", "type": "person"}
+            ]),
+        ] {
+            let raw = serde_json::json!({
+                "type": "Syllable",
+                "elrcMultiPerson": "[00:01.00]v2:Together\n[00:02.00]v1:Guest",
+                "content": [{"timestamp": 1000, "agent": "v3"}, {"timestamp": 2000, "agent": "v2"}],
+                "metadata": {"agents": agents}
+            });
+            assert_eq!(
+                format_apple(&raw.to_string(), true, true).unwrap(),
+                "[00:01.00]v1:Together\n[00:02.00]v2:Guest"
+            );
+        }
+    }
+
     #[test]
     fn apple_content_fallback_honors_agents_only_when_multi_person_is_enabled() {
         let raw = serde_json::json!({
diff --git a/test/lyrics_parser_test.dart b/test/lyrics_parser_test.dart
index 17d73378..7fbcd2f9 100644
--- a/test/lyrics_parser_test.dart
+++ b/test/lyrics_parser_test.dart
@@ -50,6 +50,20 @@ ${_tag('translation', 2000, 'Second translation')}
     expect(backing.vocalGroup, lyrics.lines.first.vocalGroup);
   });
 
+  test('V3 is a collaboration even without TTML group metadata', () {
+    for (final source in [
+      '[00:01.00]V1:Lead\n[00:02.00]V3:Together\n[00:03.00]V2:Guest',
+      '<tt xmlns:m="http://www.w3.org/ns/ttml#metadata"><body>'
+          '<p begin="1s" m:agent="v1">Lead</p>'
+          '<p begin="2s" m:agent="v3">Together</p>'
+          '<p begin="3s" m:agent="v2">Guest</p></body></tt>',
+    ]) {
+      final lyrics = LyricsParser.parse(source);
+      expect(lyrics.lines[1].voice?.isGroup, isTrue);
+      expect(lyrics.lines[2].voice?.isGroup, isFalse);
+    }
+  });
+
   test(
     'backing groups survive sorting, offsets and repeated backing parts',
     () {
diff --git a/test/now_playing_lyrics_transition_test.dart b/test/now_playing_lyrics_transition_test.dart
index 771b3382..734ae2a4 100644
--- a/test/now_playing_lyrics_transition_test.dart
+++ b/test/now_playing_lyrics_transition_test.dart
@@ -2707,50 +2707,51 @@ void main() {
   }
 
   for (final mornye in [false, true]) {
-    testWidgets('TTML group vocals keep the primary side ($mornye)', (
-      tester,
-    ) async {
-      metadataOverrides['lyrics'] = '''
+    testWidgets(
+      'TTML V3 without group metadata keeps the primary side ($mornye)',
+      (tester) async {
+        metadataOverrides['lyrics'] = '''
 <tt xmlns="http://www.w3.org/ns/ttml" xmlns:m="http://www.w3.org/ns/ttml#metadata">
-<head><metadata><m:agent xml:id="v1" type="person"/><m:agent xml:id="v2" type="person"/><m:agent xml:id="v3" type="group"/></metadata></head>
+<head><metadata><m:agent xml:id="v1" type="person"/><m:agent xml:id="v3" type="person"/><m:agent xml:id="v2" type="person"/></metadata></head>
 <body><p begin="1s" end="3s" m:agent="v2">Guest</p><p begin="3s" end="6s" m:agent="v3">Together</p><p begin="6s" end="9s" m:agent="v2">Guest returns</p></body></tt>
 ''';
-      final playback = StreamController<PlaybackState>.broadcast();
-      addTearDown(playback.close);
-      await pumpNowPlaying(
-        tester,
-        theme: mornye ? MornyeTheme.build(Brightness.dark) : null,
-        size: const Size(390, 1100),
-        playbackEvents: playback.stream,
-      );
-      mediaItems.add(item('first'));
-      await tester.pumpAndSettle();
-      if (mornye) {
-        await tester.tap(find.byIcon(CupertinoIcons.quote_bubble));
-      } else {
-        await tester.drag(find.byType(PageView), const Offset(-350, 0));
-      }
-      await tester.pumpAndSettle();
-      for (final seconds in [0, 2, 4, 7, 4]) {
-        playback.add(
-          PlaybackState(
-            playing: false,
-            processingState: AudioProcessingState.ready,
-            updatePosition: Duration(seconds: seconds),
-          ),
+        final playback = StreamController<PlaybackState>.broadcast();
+        addTearDown(playback.close);
+        await pumpNowPlaying(
+          tester,
+          theme: mornye ? MornyeTheme.build(Brightness.dark) : null,
+          size: const Size(390, 1100),
+          playbackEvents: playback.stream,
         );
+        mediaItems.add(item('first'));
         await tester.pumpAndSettle();
-        expect(
-          tester.widget<Text>(find.text('Together')).textAlign,
-          TextAlign.left,
-        );
-        expect(
-          tester.widget<Text>(find.text('Guest returns')).textAlign,
-          TextAlign.right,
-        );
-      }
-      expect(tester.takeException(), isNull);
-    });
+        if (mornye) {
+          await tester.tap(find.byIcon(CupertinoIcons.quote_bubble));
+        } else {
+          await tester.drag(find.byType(PageView), const Offset(-350, 0));
+        }
+        await tester.pumpAndSettle();
+        for (final seconds in [0, 2, 4, 7, 4]) {
+          playback.add(
+            PlaybackState(
+              playing: false,
+              processingState: AudioProcessingState.ready,
+              updatePosition: Duration(seconds: seconds),
+            ),
+          );
+          await tester.pumpAndSettle();
+          expect(
+            tester.widget<Text>(find.text('Together')).textAlign,
+            TextAlign.left,
+          );
+          expect(
+            tester.widget<Text>(find.text('Guest returns')).textAlign,
+            TextAlign.right,
+          );
+        }
+        expect(tester.takeException(), isNull);
+      },
+    );
 
     for (final ttml in [false, true]) {
       testWidgets(