I'm not too sure what you are talking about!
Are you talking about the "voltage pots" on a discrete Op Amp?
If you are, then you are probably hearing more distortion, less distortion.
Some of the pots may affect DC offset, you really don't want to adjust those, unless you want to reduce DC offset.
Note to Mr. "I Love Music": an Op Amp should take approx. 1/2 an hour to warm up.
Well, since I am far from an electrical engineer, I definitely don't understand amplifier design at all. Seems like you volunteered for it :)
Here's what I am referring to. Found it in the old Roc thread, couldn't find the phoenix one.