As I don't know what music is supposed to play, so I can't really confirm anything definite.
What I have found is that XMP shows that there are 5 sub songs and it plays them each, although they all seem to be quite similar to start with.
You can choose a sequence using the -z switch in XMP.
There is also this tracker player here
https://github.com/richardjwild/arctracker that works well.
As for disk 2, it is all level map data and graphics from what I have seen. It's funny that all the graphics are easily ripped and in plain sight!
The only other problem that the MOD is not playing all sub sequences is that the players are "broken" or can't handle the format correctly?
I can't really test on real hardware at this point as my Strongarm RiscPC is out of action for the foreseeable future
