Controlling Master Volume with CC121

Is there a way to map one of the knobs on the CC121 to control the Master Volume.

I know I can lock the AI knob to the Master volume but I am using that knob as a JOG wheel.

It seems I could use one of the Function buttons along with the Value knob but haven’t been able to figure out how to do this.

Can anybody help me??

Yes there is! The top-right knob can control either the Control Room volume, or main mix volume.

You can find the settings in Studio Setup. See attached screenshot.

Is it possible, mapping the channel fader to the CR volume?