I've been reading alot about the Sansamp bass driver on this forum and have been considering purchasing one (specifically the programmable model). Some have spoken of issues in running it with a tube amp; that the doubling of preamps can cause muddiness. I am running a Geddy Lee Jazz bass into an Ampeg Svp-Pro preamp and QSC 1850 power amp, and will soon be purchasing a Bergantino NV 610 (a sealed, tweeterless cab). The sansamp would be used as a stompbox for when I need some grit or overdrive. The drive on my preamp is nice, but it can't be controlled with a footswitch so I prefer to leave it on a low setting, as my band has songs which switch between heavy and clean, dancy parts. Does anyone have experience with the sansamp in a similar set-up that could tell me how it sounds, as I don't know of any store in my area that carries them.