This comes directly from Id Software in comp.sys.ibm.pc.games.action:

Wow.  Er.  It seems we've sorta clogged the net.

First off, thanks for the congrats and support!  We're tired and
need it.  :)

Secondly, to those of you not getting any GUS music, that's because
there's one line I commented out of the game and forgot to put back in
while debugging it last night.  Included at the end of this post is a
file to get that to work for you.  The file must be named DMXGUS.INI.
It's included at the end of this post.  Someone please put this on ftp
sites when the bandwidth comes back.  No one's here tonight except me
and I don't know what our account is on AOL, CompuServe, etc., so if
someone could upload this file to these places, I'd appreciate it.
Stick it in your DOOM directory, and when you run doom, run it from
that directory (don't stick c:\doom in your path and run it from
somewhere else).  When you start up doom with this, you should notice a
difference.  It'll hit the disk after you see the DMX_Init thing in the
DoomOS startup stuff.

Thirdly, we're trying to keep up with the net-posted bugs.  We're
trying to get a SoundBlaster 1.0 to our sound guy so that he can
figure out what the deal is (they're not made anymore).  Those
V_DrawPatch() errors will take a little while.

The follwing is DMXGUS.INI (uuencoded):

-- cut here --
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`
end