syncing roland 303 with Logic Audio 6.1

Have you set the 303 to external sync (MIDI or Slave)? If you wire MIDI out from Mac to MIDI in on 303 you should get sync if as you say the MIDI clock send is enabled in the logic song settings.

Is this an old original silver 303 or one of the new remakes? What kind of sync converter do you have? I use an old MSQ 700 to go from midi to DIN sync but not for quite some time now. Is logic set to transmit MIDI clock and not MTC? I can check that the MSQ is running as a trouble shooting step. Does your sync converter respond with any kind of indication that it is getting a signal?

It sounds like you are putting logic in MIDI recieve mode as opposed to enabling the MIDI clock send. (Did the bar at the top get blue?) Im not at my studio, but my key command for opening the sync send dialog is "command-Y" (not sure if thats a preset key command or if I customized it) you could try it. I'll be at my studio at around 2pm pst to check and will post again at that time. You must send the midi clock to the MIDI out port that goes to your syncbox.

OK. The sync output dialog is under file/song settings/synchronization. Select the MIDI tab (looks like a file folder, NOT the little icon at the top)Then you can check the "transmit MIDI clock destination 1" box. Usually you can get away with selecting "All" on the pull down menu and not worrying about which port goes where, but some older MIDI gear freaks out if it sees MIDI clock. If you have to just select the proper port from the list. If you have the MIDI out from the computer to the MIDI in on your sync box you should be good to go!