Asus Crosshair V Formula/ThunderBolt - Manual (Page 171)

ROG Crosshair V Formula 4-37
Equalizer
You can manually adjust the audio
frequency with the equalizer and
customize your presets for later
use.
Mixer
You can manually adjust the
audio volumes, including Line In,
Stereo Mix and Microphone, when
recording or during the playback.
THX
THX is a high-fidelity sound
technology that allows you to
adjust the surround sound effect,
sub-woofer volume, etc..