Acer A3-A11 - Manual (Page 31)

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Adjusting audio settings using Dolby Digital Plus
Your tablet comes with Dolby Digital Plus audio enhancement features, which
include Surround Virtualizer (for both headphones and the built-in speakers),
Dialogue Enhancer, and Volume Leveler. You can select Movie, Music, Game
and Voice presets which are optimized for each mode. You can also configure
two custom modes.
1. Open the Settings app.
2. Tap Dolby in the Settings menu.
3. Tap Dolby settings on the right to load the Dolby Digital Plus controls.
4. Select your desired audio mode or make manual modifications.
5. Tap the navigation Back icon to exit the Dolby controls.
Note: A number of items have help information, indentified by a boxed
question mark beside the item. Tap one to pop up the help information for
that item. You can also tap Play Demo to watch a video that demonstrates
the audio effects.
You can turn Dolby mode on and off from the function status and controls
panel in the Home screen.