fix(app): re-adjust volume value

app-full.py

@@ -267,7 +267,7 @@ if __name__ == '__main__':
                                 minimum=0,
                                 maximum=10,
                                 label="Vocal volume",
-                                value=3,
+                                value=4,
                                 interactive=True,
                                 step=1
                             )