Playing in my little orchestra, I try to honor marked bowings as well as bowing conventions, e.g. downbow on strong beats, upbow on "pickup" notes, etc.. The other bassist, who has even less experience than I do, generally ignores them (or has enough to do just reading and sounding the notes without worrying about up- and downbows). I want to discuss this discrepancy with him and suggest that one of us mark bowings and both of us try to adhere to them. I would probably be the one doing the marking. I know that visual appearance is one reason for bowing together, but I suspect that music is at least as important. Listening to recordings of concerts, I'm not impressed with the sound of our two-person bass section. In particular, we sound mushy and lacking attack, not helping with crisp rhythms as basses should. Would you arco wizards tell me what the musical effects of synchronized and unsynchronized bowing might be, to help me justify my talk with the other bassist? I think he'll be receptive to what I say, so I don't want to make spurious arguments.