diff --git a/node-server/assets/script.js b/node-server/assets/script.js
index 634403a..69241a1 100644
--- a/node-server/assets/script.js
+++ b/node-server/assets/script.js
@@ -51,7 +51,7 @@ socket.on('position', (position) => {
         isPlaying = true;
       }
       // SENSIBILITÉ : le facteur diviseur est plus grand → plus doux 
-      let playbackSpeed = 0.5 + speed / 900;
+      let playbackSpeed = 0.5 + speed / 600;
       playbackSpeed = Math.min(Math.max(playbackSpeed, 0.5), 1.1); // plage limitée à x1 max
       audio.playbackRate = playbackSpeed;
     }