I have seen a post on this forum before about a problem with these amps with an oscillation bleeding through into the audio path. The last post it seems was in 2009 with no resolution of the issue seemingly. I recently purchased a VS232 that needed the audio jack repaired for $50 off of craigslist. After fixing the audio jack and plugging in for a test jam, I noticed a lot of static low volume popping noises etc along with an oscillating noise. As a method of trouble shooting I simply turned down all of the settings and adjusting every knob one by one I determined that as you increase the speed of the chorus channel, the oscillating noise speeds up and slows down in the background regardless of whether or not the chorus is on. The post before seemed to be more focused on the reverb circuit and I just want to see if anyone has advice on what this could be or possibly a better method to troubleshoot. Thanks in advance for any and all guidance.