Asus HDAV1.3 - Xonar Slim Sound Card User Manual page 63

You can customize two more settings based on your needs.
To add customized settings, select CustomA / CustomB then click the Custom
button.
From the customize settings screen, adjust the brightness, saturation, hue,
contrast, and sharpness according to your desired settings and name your
customized setting. Click OK when done.
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ASUS Xonar HDAV .3