Hi guys ,..........man I'm a sucker for amps even though I have everything I need. Saw this yesterday and went to give it a try at great volumes and it sounded frikken good ! I was surprised !....especially when I was plugged into the guys Slash beat up AV cab. Had one years ago and it sounded squishy but now I know why ,........when I got back home,..couldn't play it loud because of neighbors and I heard why people say they can sound fizzy, they really need to be loud ,....not crazy loud but loud !........and the effects loop works great. Saw a post on another Forum saying that the JCM800's are getting out of reach price wise and I suspect that those 900's MKIII and SL-X will also be going up in value in the next years , not as much as a JMP or 800 but higher than they are today . A member here was saying that the Preamp volume acts on all frequencies and the Sensitivity knob acts on high frenquencies ,....If I dial both knobs at noon ,....I get 2204-ish crunch , not exactly but close ,...........today I'm gonna roll preamp tubes to see what happens .