Hola, To the doublers on the board, have you ever considered giving one up to concentrate on just one bass? I've often thought of giving up the electric so I could work on the upright. The musical progress (theory, ear training, etc.) could occur simultaneously while playing both basses, but the physical and technical requirements of each bass might interfere with each other from time to time. It hasn't seem to hurt Patittucci, McBride, etc., though. A quote from the liner notes of Dave Liebman's album, "The Tree", got me thinking of dropping one of the axes for a while. Liebman, who began concentrating solely on the soprano sax in 1980, but is back to using the tenor as well, said this: "It became obvious to me that once you get to a certain point you can't spread your energy among two or three instruments, which is what I was doing. You just don't make any progress on any of them. It's a physical thing. You'd like to have total rapport with your instrument-it has to feel like your left arm. So it seemed to me that the best thing I could do-to further my evolution as a musician-was to concentrate on one." Sorry for the long post, just something to think about.