My volume knob on my Kustom 1200 is pretty darned quiet when I'm not playing. My problem is that when a note is held out, and I tweak the knob, I get a pretty nasty pop ... which can be quite loud if I'm playing a high volume. I recently had the amp in for a few repairs, and I'm not too keen on leaving it at the repair shop again, or plunking down any more money. So long as I just don't adjust my volume on the amp while I'm holding a note, I should be okay, right? Is this a common thing? Thanks.