#1
Is anyone able to get a decent tone out any of the r-fier preamps?

Every one of them sound horrible on mine.. maybe I'm not eq-ing it correct?
#2
What kind of a amp are you using, and how is it hooked up? Are you using a SS amp? Does it have a FX loop?

Setting the GT-8 up right, to a amp and learning how to work levels are very important in getting good tones. I personally don't use the preamps. They take away from the tube tone of my Marshall. I find it better to use dst/od pedals and use your amps preamp.

I have gotten decent tones from the vint1 Rec setting, on my friends Crate GTD65.