I have peavey valveking 112 and i just bought a boss gt8 to satisfy my pedal needs. I have heard from lots of people that multi effects pedals sound best when bypassing the amps preamp.... i'm assuming that that means running them straight into the speakers.... how do i do this??
No, it means running it through the effects loop of your amp, if you have one. They're usually found on the back of the amp.
Just put it in your VK's loop.