I have a Duncan STC-3M3 Tone Circuit for MusicMan. The info on the Duncan site says it's intended for single-pickup basses, but I'd like to use it on a bass with multiple pickups (three magnetics and a piezo, with blend knobs and a Bartolini piezo buffer). I asked the Duncan folks if this would be possible and got some lame response like, "No, you cannot use it with multiple pickups because there is no blend control." Well duh. But I could just add one, couldn't I? Is there actually any difference between the Duncan MM pre and their regular pre, apart from the presence or absence of a blend knob? Is there any reason to believe that running multiple blended pickups through the MM pre wouldn't work properly? I don't see why the pre should really care how many pickups it's being fed... is there something I'm missing?