I just got this amp and I haven't spent enough time with it yet to know how to dial it in but I couldn't resist profiling it. So I threw an Audix i5 in front of it and hit profile. There are two profiles, both are exactly the same except one is using the high input and the other is using the low input.
Try it with some old Zepplin, AC/DC, Bad Co, etc. What do ya think, is this amp a keeper?
Just search for "Dirty Shirley" under Amp Profiles in the Rig Exchange...