I use a pretty basic rig.
Fender guitars into fender tube amp.b9
Pedalboard consists of 2 overdrive pedals a delay, a chorus and of course the B9.

I have used every configuration of routing my guitar signal through the pedals and I cannot get rid of
an annoying sound being created by the B9. Oddly enough it’s a perfect B note. Does not sound like an organ sound just a high solid pitch sound.

This is not just when the pedal is turned on or when any of my other pedals are turned on. The sound exists on its own regardless of what I do. I’ve tried other amps, multiple guitars and as I said have re routed my pedalboard in ever way possible.

When running through the B9 pedal only, it works perfectly.

I will hate to see that pedal on the shelf but I can no longer stand the annoyance. When were preforming, it’s not noticeable as long as we are playing but when we are in between songs it’s just become to embarrassing. And the sound tech is fed up with having to pull my volume after every tune.

Any ideas? Do I have a lemon?

Thanks for any input.