#1
i just got a peavey classic 30 moments ago. i been playing with it and cant seem to find the great distortion everyone is always talking about. what are the exact setting (where should knobs be turned to) to acheive this.

also what are some good pink floyd settings?

i cant figure this out myself , i tried,
#2
Turn the pre-gain all the way up and boost it with an OD pedal.

For the settings, check the stickied thread.
#3
I always use the clean channel of my Classic 30 with distortion pedals in front. I never warmed up to the C30 crunch. Although InfiniteRain's suggestion of combining an OD with the dirty channel may be a good one.