I discovered that the included S3M module decoder has support for playing Adlib files. I had the Starport BBS Introtune.s3m with some other mods and it played almost perfectly.

The same cannot be said about an adlib mod of mine, which plays quite badly. I wonder if you could improve the engine, even though it is of limited use.

-Here it is the file: http://psycle.free.fr/josepma/adlib/ADLIB.S3M
And here a sound capture of Scream tracker 3.21 running under DosBox: http://psycle.free.fr/josepma/adlib/adlib.m4a