Found this on Atari Jaguar Fans, Facebook
"Some of you might find this interesting. I figured out how to mix music and sound in Jaguar Doom, the results however are quite terrible. The music sounds quite scratchy and choppy but everything else runs fine.
Here is a better example, apologies for the poor camera work. I was trying to film and play at the same time.
It really seems like the id Software team almost had it but ran out of time, IMO."