A few members of the Atariage forums have continued their work on the Atari Jaguar version of Doom. The official release had no music at all and was missing certain elements of the original PC version.
A video was just posted showing the music being added back in, as well as an enemy that was previously missing! This is an amazing accomplishment, as the assets had to be manually added to the game; None were ‘there but disabled’ like you’ll occasionally see in ports.
More information is available on the forum thread here and hopefully we’ll see a beta release soon!: https://atariage.com/forums/topic/287323-enabling-music-sound-fx-mixing-within-jaguar-doom-source/?do=findComment&comment=4341411
I don’t think a public beta has been released, but I’ll update this post if I hear of anything!