Ian, you used a Twin Reverb for keyboards? So did I. I different times I ran a Farfisa Combo Compact, a Hohner Painet and a Moog Opus3 through mine. I also used it for a PA for a while once I got a Leslie for the Farfisa. I bought that sucker from a high school classmate for $50 and sold it for $400. Now I could kick myself...