C. GAIN
The GAIN knob rotation increases or decreases the input source gain.
The GAIN value is associated with the selected source ChA/ChB, not with the physical channel.
By switching the source the gain is always suitable to the connected one.
The GAIN value is the latest setting is seated by the knob.
The GAIN affects at the input level with +/- 20 dB.
Rotate a GAIN knob, it’s will active SET mode and shows the setting and GAIN level at the display.
The step of the GAIN adjustment knob is 0.5 dB.