Does Joe know that there is a Bob on the horizon, and vice versa? Personally if I was a bassist and I showed up to the first band practice, only to be confronted by another bassist, I'd be pretty upset!! I'd be even more upset if I then had to be judged by the drummer. My advice is that you should make a decision about one of the guys and go with him, for better or worse. It sounds like you already prefer one so what's the problem? Sometimes you have to be decisive for a band to succeed. Good luck, Steve