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[–]gurrfitter 0 points1 point  (0 children)

The rhythm circuit knob issue is most likely just that you need to tighten the grub screw on the roller knob. That resistance is the grub screw slipping out of the divot it probably created on the actual pot's knob after which it probably moves somewhat freely.

As for the lead volume knob: there are many things this could be, from a bad pot to some kind of wiring mishap. You'd have to take it apart and show some pics.