eclips,
I have a POD Pro modeling amplifier which has MIDI, SPDIF, and analog connections. It also comes with Sound Diver software by Logic Audio. I've successfully transfered the Sound Diver files from the POD into my computer, but I really havn't taken the time to play with it much. The idea is to be able to record all kinds of classic amplifier sounds directly into the DAW, or some use it live. I still don't know everything Sound Diver does, but it is a $200 Logic software program. I did discover that MIDI travels in channels like a TV tuner. There are 16 channels.
That's not much help, but I can't say what I don't know.
Chuck