Would it be possible to add a second variable to the change-soundtrack sexp to be able to specify an alternate track?
For example.
I have a mission where I'm using my own music using the alternative music selection in the mission specs editor. The default is a standard FS2 track in case the player hasn't downloaded my music. In that mission I want to swap to another track that has a more suitable post-battle ambient, and then swap back to the previous.
However, the current change-soundtrack sexp would only work if the user has downloaded the custom music.
So instead of:
change-soundtrack
<mymusic>
could it be:
change-soundtrack
<standard_soundtrack>
<my_soundtrack>
?