I recently installed an STC-3M4 preamp in an NS Design WAV4 bass I've rebuilt. The bass has an aftermarket Lace Alumitone pickup as its only pickup. I run into a Korg floor tuner, then from there into a floor pedal preamp, then directly into a sound system. When I plug this bass into the tuner, I can tune with the volume turned all the way down. Volume up or down, it makes no difference to the tuner. However, when I kick the tuner off, the bass acts normally. No signal at all with the volume all the way down, signal when I turn it up. I ran it directly into the floor pedal preamp and it acted normally. I tried two other basses through the tuner--one active with an STC-2C-BO active EQ, the other passive--and neither of them would register a signal to the tuner when turned all the way down. This is the only bass I have with the STC-3M4 preamp in it. Is this some kind of weird behavior that is peculiar to that preamp? I triple checked my wiring, and it is all correct. I guess it's not critical since it works fine when I'm playing it, but it's just plain weird. Can anybody explain this?