We meet again John!

4 channel devices: I've no idea about them.

2 sound cards in a PC: I have done this but I had quite a fight with interrupt conflicts before getting it to work. I have never tried sending to 2 MIDI devices at once though. My set up used an old card which had an excellent MIDI daugther board on it for MIDI and another card for the audio. I sent the MIDI output via the line out from the one card to the line in on the other rather than use one pair of speakers for MIDI and another for the rest.

How to send MIDI to 2 devices: This is uncharted territory but even my old version of Cakewalk 3 allows you to select more than one MIDI output device (Settings/Device/Output Device). If you select 2 devices and go to Settings/Patch List, you would notice that different port numbers are assigned to different playback devices. These ports can be assigned to individual tracks in the MIDI.

Anyway, I THINK that is how to do it with that piece of software - other software may have different methods. If you need any help with Cakewalk 3, you have my email address...

Do you have access to a MIDI keyboard by any chance? Most soundcards have an external MIDI port. It MAY just be possible to configure something like Cakewalk to send one port to the soundcard and another to the keyboard. That would be a lot easier than messing with 2 soundcards.

Jon