I tried searching the forums and the intertubes for this, and all the questions and answers were Windows specific.
I have my R3 hooked up to my Mac (Leopard 10.5.4) via USB. It's being recognized as a MIDI device and works fine as such in Live 7 for instance. When I try using the transmit/receive functions in the Sound Editor I always get the message "Transmit Program failed : MIDI device is not specified."
In the preferences I have the MIDI IN set to R3 - MIDI IN and MIDI OUT set to R3 - MIDI OUT. Being a complete n00b this could be wrong, but it seems pretty straightforward. I HAVE tried every combination of options in those two menus.
I've tried changing USB ports, making sure sysex is enabled on the R3, made sure that routing is set to USB/MIDI and also tried setting it to USB only, reinstalled the drivers from korg.com, restarted the computer etc etc...
Any advice?
I'm really hoping for a "you forgot to press button x" answer