My combo amps seem to become heavier each year, for some reason and I need to find a lightweight replacement, but the choices seem bewildering. I play with a small jazz combo and an old-time fiddle group, using a passive Carvin 4-string bass with nylon tape-wound strings (trying to approximate the tone of an upright). Most of the time, my 50-watt Ampeg is loud enough, but occasionally I need the old Peavey TNT 130 (with 130 watts and a 15" speaker). I'm intrigued by the MB10, for its light weight and its tone controls, but I've seen conflicting reviews. Questions: Can it be made to sound warm, perhaps by use of the Drive control or Contour? Can it possibly put out as much sound as the Peavey, on an outdoor gig? Any and all advice would be appreciated. Thanks in advance!