PreAmp
Source Select Displays the current source to the channel. To choose a different source use the drop down Device menu. Press Apply to confirm the selection.
PreAmp controls Appear if a mic/line socket is assigned to the channel. To turn phantom power on or off press and hold the 48V button for a second. Make sure the channel is muted before doing this.
Stereo Image on Stereo Input channels provides Width control to adjust from mono (0%) to stereo (100%), and a choice of stereo source Modes:
Trim Provides +/-24dB gain adjustment.
Polarity Reverses the polarity of the input.