Per-app volume

Per-app volume provides an independent gain for apps that are currently playing audio without changing the global media volume. It is useful when music, games, navigation or call-assistance audio play at the same time.

Enable it

Open Settings → Sound & vibration → Audio → Control volume for specific apps. The switch is disabled by default.

When enabled, the system volume panel shows the per-app volume entry. It lists apps with active playback tracks and lets you set each app from 0 to 100. An app may temporarily disappear after it stops playback and releases its audio track.

How it works

SystemUI obtains the active app audio tracks from AudioManager and converts the 0–100 UI value to the 0.0–1.0 gain used by AudioFlinger. During mixing, AudioFlinger multiplies the app gain with the media-stream and port volume values. Therefore:

• Lowering one app does not change other apps.
• The system media volume still controls the final overall loudness.
• A new playback track from the same package inherits the app gain kept by the running AudioFlinger process.

The interface is protected by MODIFY_AUDIO_ROUTING; ordinary third-party apps cannot change another app's volume directly.

Limitations

App gains are kept in AudioFlinger runtime state rather than as long-term user settings. They return to their defaults after the audio service or device restarts. Apps without an independent audio track, using a special direct path or playing through another process may not appear under their expected name.