Hi,
Bad to hear about the bother your having with the pot/knobs. It's mostly likely self explanatory due to wear and weakening of the knob&components. You want to get that fixed as soon as really, because eventually bits and pieces could break off and go inside the unit. Then your in real bother.
A couple of things to prolong pots (also self explanatory)- just go easy on them. It's so easy to get carried away with an aggressive sound and tweak the hell out of them - but really, you want to tweak adequately, but carefully. My guess is - the person you got it from was having problems with volume and just had a bad 5 minutes.
Probably one of my only pet hates about modern VA's is their 'occasional' weak feel in design. Take an old classic, and the interface & pots are going nowhere most of the time. Hope you get it fixed.
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