I have a Gretsch Electromatic solid body and a Fender Princeton 112plus combo amp. I use a Boss GT100, a Strymon Bigsky, and a Garagetone Drivetrain overdrive pedal (I know it's not the best setup but I'm working on it). The chain is guitar to overdrive to Bigsky to GT100 to amp. The GT is powered by its own power supply and the the other two pedals are powered by a Visual Sound Onespot. I'm trying to diagnose what's causing the feedback I'm getting (a really loud buzz). If I plug each of the pedals in individually, I get no noise. It only comes when using all three. Any idea what might be doing it?
Try the pedals with batteries. You may have an earth loop.
Could it be a bad patch cable? And +1 on using batteries