Kramer Electronics VP-8x8AK - Manual (Page 37)

Controlling via the Embedded Web Pages
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9.3 Audio Gain Page
The AUDIO GAIN screen lets you set the gain for each of the input and
output channels:
Figure 27: Audio Gain Page
To change an input or output gain, select the channel number, then click and
hold the + or – buttons to increase or decrease the gain, respectively.
A single click will increase/decrease the audio gain by 0.5 units; double click
to increase/decrease the gain by 1 unit.
The Help Box ?
In this page you can control the audio gain of the channels.