How did he change the OTS cleans to Bluesmaster spec then?? My OTS's clean channel sucks ass. Apparently the Dumble is supposed to be a modified Fender Twin, my clean channel certainly doesn't sound Fendery at all. Zero headroom and sounds spanky than the chimey cleans Fender are renowned for. I use a strat through my OTS and the OD channel is a bit too fizzy and no bottom end at all, but when the PAB is engaged, it sounds much better, more open and harmonic. Maybe has something to do with the V30 I'm using instead of a EVM12 or G12-65??
I have no idea what he did to my amp. I can't even solder a guitar cable. Perhaps you could pm him (Erwin_ve).