...the knob is way too unresponsive when adjusting the volume.

There's a trick to that. If you turn the knob slower, the volume will change faster. The empeg skips volume adjust signals that come too close together, so grabbing the knob and giving it a fast spin will have little effect, whereas a more reasoned turning of the knob will change the volume quite quickly. I just tested and I can change the volume by 30 dB in less than one second by forcing myself to turn the knob slowly.

tanstaafl.

"There Ain't No Such Thing As A Free Lunch"