I am reviving this thread with a resolution to the problem I was having with my F#. It was the F# on the D string mostly - for the record. What seemed to be the problem, as drub suggested, was that there was a resonance problem. As I have been playing in the basement, I noticed that the D and A strings were causing the body of the bass to buzz a little. I took my bass to the luthier and he and I located the problem at the bridge feet where they meet the top. They were not as flush to each other as they could be. So I left the bass with him to sand the bridge feet to make a perfect fit. Problem seems to be solved with the buzzing and overall sound. I haven't played a show out yet but I wanted to kinda close this thread so if someone ends up in the same situation as me, they won't think it's just the electronics.