IT2AGI
From Sierra Wiki
ImpulseTracker
Nat Budin wrote the tool "IT2AGI" to convert ImpulseTracker files to the AGI sound format. I'm assuming he used it to create the music for the excellent Operation Recon demo. You will need ImpulseTracker to create the music and the Perl runtime to run the Perl script that this converter is written in (see the Tool Locations section).
To convert music, try typing this from the command line:
perl it2agi <name>.it
The script will produce a file called "<name>.ags".