Time to bring this thread back from the dead once again.
I attempted to extract all the sound effects from the AutoDemo. The game keeps it's sound effects in the .MLT files, which you can extract and convert to dsfmini/dsflib files. The MLT files themselves hold multiple banks which seem to correlate to their use, although not every MLT file uses all banks:
Bank 0x0 - General player action sound effects (ring sfx, jump sfx, etc - this is duplicated a lot)
Bank 0x1 - Area specific sound effects (objects mostly)
Bank 0x2 - More general player action sounds (seem to be meant for general objects the player interacts with and other things, like item boxes and brushing up against bushes)
Bank 0x3 - Player action sound effects (the P_* files)
Bank 0x4 - Enemy sfx
Bank 0x5 - Ambient/Environmental sound effects
Bank 0x6 - Cutscene specific sound effects, used by the E_#### files. Also contains player action voices.
I extracted the MLT files using dsfmake (for extracting), dsftime for timing/fade correction, and dsfsndext for figuring out how many banks each MLT had. For some reason, the script doesn't like the AutoDemo's MANATEE.DRV, so I used the final's MANATEE.DRV instead and I was able to get most of the sound effects out. There are still some that can't be played for some reason, but a good chunk of them play at least.
Some interesting things to note:
1.) Even though the AutoDemo uses the ring sound effect when rescuing an animal, the sound effect for collecting one exists but isn't used (it seems different too).
2.) The classic bubble collect sfx is present! But there are no air bubbles at all in SA1...
3.) Likewise, the classic drowning sfx is also present! In the final they just use voice acting. (Does anyone know what happens when a character drowns in the AutoDemo? Can they drown?)
4.) The classic sound effect for losing a shield (the generic hit sound that doesn't involve losing rings) is present but not used.
5.) The Chao voices are all in ALIFE Bank 1. There are some Chao voices for actions the Chao can't seem to do in the AutoDemo. The bank also includes all the animal sound effects plus some other weird mysterious stuff.
6.) Even though most of the level assets aren't present the sound effect files for Sky Deck, and Chaos 0/2/4 still exist. TARGET.MLT is Sky Chase I think?
That's pretty much all I could see from going through everything once.
You can download the dsfmini/mp3/mlt files here. Some of the sound effects might not be playing at the right rate, but some of them sound fine. Now we just need to directly compare these with the final version to see how many really are different...