Hi, I've had this issue for a long time, but I've never had enough free time to actually address it. I installed an Aguilar OBP3 in my Yamaha John Patitucci, and everything works great except the blend pot. The pot itself works (I presume, since it pans between the two pickups), but I think there's something wrong with the taper or value. The problem is that it's working more like a 3-way switch than a blend pot -- I can get neck solo, bridge solo, and both full. I cannot get 75% neck 25% bridge etc. Any movement away from the center detent yields solo output of the selected pickup. Any ideas? Wrong value? Bad hookup/ground? edit: I think the pot is 500k, but I'm not sure - the Aguilar diagram doesn't specify and I don't have my bass on me at the moment.