Acer M230 User Manual page 29

Treble
Boost or reduce high audio tones.
Bass
Boost or reduce low audio tones.
Balance
Change the balance between the left and right speakers.
Steady sound
This function prevents sudden changes in the audio output level. If this function is On,
volume levels will be consistent when switching between input sources and changing
channels.
Sound effects
Turn Sound Effects on to add virtual surround sound. If Sound Effects are on, Treble and
Bass settings are not available.
Digital Audio Out
This allows you to set the type of Digital audio signal that is used.
Reset audio
Return all audio settings to default values, removing any changes.
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