#1
to start off here is my setup:
american strat ---> SM7 smash box ---> df-7 digitech distortion ---> boss chorus ---> fender tuner ---> laney vc30 amp

the problem that iam having is when i turn my distortion pedals on i get some noise in the background... louder than normal noise. when all pedals are off i still get some noise but not as bad. when i switch my amp into overdrive the noise picks up again.

however, when i just run my guitar straight to the amp and then kick on overdrive i dont have that nasty feedback. i have the same problem on several amps.

if anyone knows of a way i can eliminate that nasy feedback noise it would be greatly appreciated if you could let me know. thanks.
#2
check your pedals one by one. then. slowly add pedals into the chain.

That should reveal if it is one of your pedals.