Good Question! I don't know.
I know I wanted something Simple because in the Past all the midi stuff confused me.

So Using the Acid Pro 4 Record WAV function allowed me to take my WHOLE output from My instrument...16 tracks at once with voice and make Left and Right Stereo Channel...

But where Acid PRO 4 is cool ...then I can make as my 3 and additional tracks... MIDI or WAV and keep adding to the orginal track all the WAV or MIDI channels I want!!!!! ... and it has Soft Sythn in it ...

Maybe start a new thread on ACID PRO 4 and Multi-track MIDI recording...so MORE people will look at your NEW THREAD ...

Although you may get lucky with someone POPPING in here and answering!
GOOD LUCK!