Channel Volume Doesn't Work

I might be misunderstanding how to set it, but holding Assign, clicking listen and then rotating knob 1-4 seems to move a slider on the screen but the volume of the channel never changes - nor do I hear any drive effect. What am I doing wrong? Firmware 2.0

Do you have VELOCITY=LEVEL in the main settings? I think if so that takes sole control of levels then, and you can’t use velocity to overdrive the signal like you can taking level past halfway.