Talk about awesome service and support. Go GOG Go!

the new upload did NOT work for me.
only the steps written by sndwv did it!

sndwv:
EDIT: What I did in the end was delete scummvm.ini and then start the game. The ScummVM GUI will come up and you can reconfigure the game from scratch: click 'add game...', point to the The 7th Guest folder (probably 'go up' one level from the scummvm folder). Then, in the 'audio' tab check 'overríde global audio settings' and select the desired music device. You will probaly also want to check the 'full screen mode' checkbox under 'graphics' options. Click 'ok' and you should be set!

Great! Thanks.

I tried following your direction and I just couldn't find the ScummVM.ini file you mention. I did notice however that when I start my GoG copy, it goes to that loading screen about the General Midi drivers automatically. Has there been an update that does it automatically since you posted this? Also, is there somewhere I can find a comparison between the two versions of the music? I kinda like seeing differences between these sort of things. I find it interesting for some reason.

Edit: Never mind! Just saw a reply that says it was updated.

Just to add:

This doesn't work for the Mac OS version as well. Trilobyte released a new version including emulation, so that ScummVM is not necessary anymore. Therefore, you will always get the best audio quality.

Even more so, in the Mac OS version the audio files are "pre-rendered" m4a files (see screenshot).

...aaaand a follow up for the Mac version :D

Unfortunately, there has been a problem with the can puzzle and GOG temporarily switched back to the ScummVM emulation version until there is a fixed native Mac version available. Until then this "music fix" applies again, at least for the Mac version ;)