Take the number of the planet type, divide by the number of tracks, and the remainder will be the number of the orbit track.

As TiLT said, some game elements have extra support added for multiple tracks. Utwig isn't the only one.

I intend to make the resource code more generic, at which point multiple tracks for any occasion would be possible without special support.

That would be cool.

I was curious about this myself...

I assume the 3DO staff could've easily programmed the additional orbit mixes, but the new Precursor release of TWO functional Utwig songs have me baffled.  How could the code already support having seperate tracks before and after Ultron when there was only one before?

Not that I'm complaining; was just surprised it was possible.

Then again, maybe there were already two Utwig tracks and my memory is just bad...

That coding could have already existed, then again, that could have been added by the UQM team when they developed the addon features.  My biggest question is, if it does do that for those music, can it do the same for music for things like hyperspace, where there isn't a separate folder defined and they are all in the lbm folder.

Ok.... I hope I can make some sense of this question, and hope that it can be answered.  What I am wondering here, is, just like how there are multiple "orbit" music files, where each planet seems to load a different one of them (I'm guessing it's random based on some pre-defined seed value), making a flexible, dynamic effect on the music (rather than everything being always the same song over and over again), is that same thing possible for other music?  Like.... if I have three different songs I want to have randomly used for the Orz, can I have them as three different-named files in the content/comm/orz directory and it work?

Second, in a related problem, there are a few "trouble" directories I'm not entirely certain that this could work with -- the content/lbm directory, for instance.  What if I want to be able to have multiple hyperspace songs, and have it randomly select one every time I go into hyperspace?  The reason I ask, is because unlike the /content/comm directory, where there is a different sub-directory for each race and I could concievably see multiple songs being capable of being loaded there, I don't see that as quite as likely an option in the content/lbm directory, where there are specifically-named music files, for a wide variety of different in-game elements defined (like hyper.ogg, etc.)  If the answer to my first question is "yes" -- that is, it's possible to have multiple music files for things in the content/comm directory, then is it possible to have multiple music files for things like hyperspace, quasispace, etc., which are stored in the content/lbm directory as well?

This would be a real cool feature, if it is possible.  Because I would love to be able to randomly choose between the PC, 3DO (if applicable), and Precursor's Remixes during gameplay, and have any of the music just load up as it is selected, rather than always a single piece of music being used for things like the starbase "menu", or when I talk to the Syreen.