I am having some issues with the sound on my Haunted House. If I let the machine run a long time the sound becomes garbled and sometimes just intermittently disappears. I can bring it back by adjust the two pots on top of the board but I know they are not supposed to be turned unless doing the "recommended calibration" or so says the manual.

My questions are number one, are the pots the problem and number two, what is the procedure for this "recommended calibration"?

I have replaced the caps and reflowed it on the amp and pots. Anywhere else to look on these boards for trouble areas of solder

I adjusted the pots through the guess and check method and have it running pretty good. I was more just curious if there is a method for calibration or if it just play with it til it sounds right