Mixer Balance/Pan with keyboard or mouse?

From the documentation it appears I could turn the ‘back’ knob to adjust the balance/pan. I am running off the Raspberry Pi image. How can we adjust the pan with keyboard or mouse? Thanks!

I figured it out eventually! Comma or Period is for ‘BACK’…after selecting the Synth Chain I want to pan, I have to use the ‘modifier key’…CTRL, so CTRL Comma and CTRL Period to adjust the Pan.

Yep! And this is configured in webconf keybindings