Asus Xonar U1 - Manual (Page 31)

25 ASUS Xonar U1
5 Recording Volume
Slider
Drag this slider down to decrease the recording volume; drag
up to increase the recording volume. The tool-tip reveals the
percentage number from 1 to 100 in terms of the full scale
level.
6 Left/Right Balance This horizontal slider controls the volume between the left
and right channels.
7 Reset Reset all volume controls to the default settings