Thanks for your answer! Don't know which are the new levels. Maybe Mission 9? Possible.
But yep, music came back later. Another strange sound issue that in the last 2 Missions
the sound engine gets overloaded or something, because continuous shooting doesn't
produce any effects, but if I stop for a second and shoot only one projectile, the effect is
audible. Strange.
Thanks again, the issue sorta solved itself, it was just strange for an AS game to not have
combat music. On a note, when I checked the error log it seemed it tried to load action06
and action10.ogg but was unable to do so, since those files don't exist in AS2: R.