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Weeping demon question (squeal when it turns on and off)

I've had my demon for awhile and its on autoswitch. Everytime i start to step on it to wah it squeals first starts wahing. It's not a high pitch squeal, but a low sound that's annoying to hear when it turns itself on and off. Anybody else have problems with their inner demons?
 
There are trim pots beneath the treadle (foot switch). See if adjusting them helps.

if your using the auto function....try adjustiing the filter sweep and the timing function....it could just be your settings

Actually, it could be your basic settings as Snakeman said. I try to set the dials so the un-wahed tone matches the beginning stages of wah, as closely as possible. That makes it sound more seamless.