#1
Hello. i have an les paul. the problem is that the amp is squealing on the treble (bridge) pickup. it squeals on overdrive chanel.
#2
1. How loud are you playing and how much gain do you use?
2. Does it squeel always constantly, or only if you're not muting the strings?

If it always squeels, it's probably the bridge pickup that is microphonic. You can have it wax potted, which will solve your problem, or just throw in a new pickup of own choice.
Hufschmid
Blackat
Washburn USA Custom Shop
PRS
Mayones
Orange
Diezel
Engl
#4
Play your guitar through another amp
and
play another guitar through your amp

and you'll know.............