Hmm... I could be very wrong, but I think I remember that if you put the cards in an UNenhanced IIe it will still work.

I'm pretty sure my good friend that had one used his MCMS that way.. I would have remembered if he had a II or II+ unit..

The "upgraded" system I know for a fact works only in the Uneenhanced IIe as the latest it would go, but that is a MX-5 single board synth card..

Good luck, If I remember anything else, I'll post back. One day I would love to use my Soundchaser again in freeplay mode.. Still looking for Turbo-Trax for that setup. But if you need the chord/ear training software. THAT I can gladly hook you up with.