second flow

src/screens/Studio/SongReady.js

@@ -1,3 +1,4 @@
+/* global setInterval, clearInterval */
 import { useFocusEffect } from "@react-navigation/native";
 import { useAudioPlayer } from "expo-audio";
 import { BlurView } from "expo-blur";
@@ -51,11 +52,18 @@ const SongReady = () => {
 
   // Sync progression depuis les players
   useEffect(() => {
+    // expo-audio returns seconds on native, but on web values can be milliseconds
+    const toMs = (t) => {
+      const n = Number(t || 0);
+      if (!isFinite(n) || n <= 0) return 0;
+      return Platform.OS === "web" ? n : n * 1000;
+    };
+
     const id = setInterval(() => {
-      const d0 = (player0?.duration || 0) * 1000;
-      const p0 = (player0?.currentTime || 0) * 1000;
-      const d1 = (player1?.duration || 0) * 1000;
-      const p1 = (player1?.currentTime || 0) * 1000;
+      const d0 = toMs(player0?.duration);
+      const p0 = toMs(player0?.currentTime);
+      const d1 = toMs(player1?.duration);
+      const p1 = toMs(player1?.currentTime);
       setProgressInfo({ 0: { pos: p0, dur: d0 }, 1: { pos: p1, dur: d1 } });
       setIsPlaying({ 0: !!player0?.playing, 1: !!player1?.playing });
     }, 300);
@@ -103,6 +111,7 @@ const SongReady = () => {
       const pos = Math.floor(dur * ratio);
       const player = idx === 0 ? player0 : player1;
       if (player && dur > 0) {
+        // seekTo expects seconds
         await player.seekTo?.(Math.floor((pos || 0) / 1000));
       }
     } catch (e) {