I love this game, Bought it the second i saw it on here.

I was thrilled with GOG Including the Soundtrack
but when i listened to it, it sounds like its off

I grew up on the AdLib version of the game (Sound Blaster 16)
I heard the Gravis and AdLib version and it sounds nothing like any of the two.

Greatest example is Ashes (Course Select)

AdLib: https://www.youtube.com/watch?v=Vdg28fnGPAk
Gravis: https://www.youtube.com/watch?v=dS3KGpU3SFg

Download the soundtrack and listen to the track.

I don't know how all that works exactly, but maybe you could try contacting Support to see if they'd create a separate OST with AdLib versions?