I just bought a Peavy Envoy 110 and I'm not sure which channel to use my effects through. The clean channel has 3 different sub-channels, and each of them gives me horrible buzz. Is this something that a noise gate can fix or is this amp just not designed for effects?
look on the back of the Envoy, if I'm right, there SHOULD be a line-in or an effects loop input.
but don't hold me to that.
if i could find my manual for my amp, i'd be able to tell ya.
what kind of effects pedal(s) are you using?

this is a modeling amp right? Often times modeling pedals thru a modeling amp = no go.

what happens when you play without pedals. have you tried the Low Gain input jack instead?

can you try a different guitar and different lead cables?