I have an old 200MB and a 700RB. I also have a 115T and a 210RBH. Very happy with them. I use different basses - especially a Fretless Fender Jazz with DiMarzio pickups and a Fretted Fender Jazz delux. I find it very hard to get what I think of as a decent sound with the fretless out of the 700RB, but with the 200MB it is far more musical and better. The fretted is fine with the 700RB, if a little flat - needs rather more of the preamp than I would have expected. If I run the 200MB through the 700RB (through the effects in) that sounds very nice, with some added phasing of course. Basically, putting the fretless through the 700RB compared with the 200MB is like changing from a Morgan to a Ford with a V8 - it has a lot of poke, but is very unresponsive. Any suggestions? It does not matter too much practically as I do stage work with the 115T as an external to the 200MB which works fine. But just why the later and in principle far better 700RB should be so oafish with the fretless feels odd. Is it a setting issue? Getting an external preamp seems silly, given the vast EQ built in to the head. Any ideas?