The Signal Mixer is where volume and panning is set for the three Voice Panels "channels."

Channel 1/2/3 Common Controls

Channel External Level Control jacks- These are bipolar CV inputs for controlling the volume for each channel.

Channel On switches- The channel is enabled when the corresponding switch is in the down position. These are particularly useful for disabling Voice Panels when editing sounds.

Volume- Sets the volume of the corresponding Voice Panel (that's five seconds of my life I just wasted).

Pan- Sets the left/right pan position of the corresponding Voice Panel. (there's five more!)

Total Volume- Master volume setting for the entire instrument.

External Level Control jack (master)- The single jack beneath the VCA symbol is a master CV input for simultaneously controlling the volume of all three channels.