For example. Without a SCC-1 the guitar in the character creation scene is always flat and the reverb just doesn't sound right. Another scene is Erana's garden. Without a SCC-1 one the guitar is flat again and a midi "sweep", it almost sounds like a "wah wah" sound thats on drugs will not play correctly. There are a few other scenes that have problems, but these are the two that come to mind right away.
QFG4 has no SysEx.
I think I know why this is happening- it's either one of two things:
1. You're playing the Windows version (the music messes up in that QFG4 version)
2. Your synth isn't getting the pitch bender messages and your guitar isn't playing correctly. This is sent via SysEx and a lot of soundfonts won't receive SysEx (some will).
If it doesn't it won't bend correctly and something like a rock guitar that has pitch messages will mess up totally.
As for this Ari remark I never replied to:
Well, as you know, GS instruments don't necessarily imply the use of sysex.
I know, that's why I was asking.
Anyway, in the case of Sierra games, AFAIK, all sysex is transmitted at the beginning of the game, so you're unlikely to find any messages in the middle of the game.
I know this doesn't really answer your question, but that's as much as I know.
Actually, MT-32 games often have SysEx in the middle of them. SC-55's as far as we can tell don't but I wanted to ask.
Regards,
- Alistair