# Audio subscribe method

    subscribe(
      callback: (isEnabled: boolean) => void
    ): void

Subscribes to changes to isEnabled. `callback` will be called with the value of
[`isEnabled`](https://developers.google.com/gamesnacks/developer/sdk/audio/isenabled) when it changes.

## Examples

    engine.sound.setMute(!GameSnacks.audio.isEnabled);
    GameSnacks.audio.subscribe((isEnabled) => engine.sound.setMute(!isEnabled));

## Requirements

See [`isEnabled`](https://developers.google.com/gamesnacks/developer/sdk/audio/isenabled).