I've got one of the Ibanez SR506 models from 2004, mahogany body, wenge/bubinga neck, Bartolini MK-1 electronics. I've been pretty pleased with the tone, but after playing my Fender Jazz from time to time, I kind of miss having a good passive tone. With that said, what preamp would you suggest to replace my MK-1? It's 3 band, 9 volt. There's two small knobs for volume and blend, and 3 for the EQ. The most important thing is that it's still 3-band, preferably volume/ volume, and has active/passive switching with a passive tone control.