I'd have to agree completely with shad0wfax. I much prefer the sound of my SC-8820 playing in it's default mode, over the SC-55...when I listen to Sierra GM soundtracks. Even though there are subtle differences in the overall mix, I feel the sound is so much better from the 8820. (And, I don't always care for Sierra's mixing abilities, anyway.) But I don't feel it's a 'radical' difference than the SC-55, in terms of the mix.
Off hand, I can't think of any sound that I prefer on the SC-55 over the SC-8820...not even remotely. I also notice a general overall warmth and depth in some sounds on the SCB-55 over the SC-55, which I also prefer over the original SC-55. But from it's introduction, I've always loved all of the SC's organs, and I feel they've improved with each new SC model.
Well, for Sierra GM games, I vastly prefer the 55. Space Quest 6 is a great example.
55 tones I prefer over the 8820? Saw Wave would be an obvious one, and Honkytonk, and probably a few scattered others. It all depends on the individual song file, anyway.
- Alistair