Sorcerian = MT-32 (although the MT-32 soundtrack is very poor in many places, IMHO. Falcom has released a lot of very good Sorcerian recordings, which I'll one day make available on SMC)
King's Quest 7 = SC-55
King's Quest 7 has no MT-32 support. It's one of those god-awful MT-32 games. No effort was made in making the GM-game MT-32 compatible, so pan flutes in GM (which there are a few of in KQ7) become StickyMS (a sound effect), from memory anyway. You'll find most tracks aren't worth listening to.
Worst of all- try some of the English Horns in chapter 4 and so forth- don't listen with headphones, because they're ear shattering (MT-32 doesn't bend that way)!
I know Alistair's opinion would be that is not the original soundtrack
That's kind of an unfair thing to say- it implies I'm some hardass, unappreciative guy. I very much appreciate the stuff you've done with Jones, Dr Brain, etc.
With KQ7, it's different to say KQ6 or QFG3, where some effort went in- the MT-32 soundtrack isn't just not the original score, it's the other way as well, it's really bad. If you're brave enough to attempt it, you'll find out by the time you're halfway through