Is it possible to use this mod simply to pick from a playlist of songs that play when a battle begins? Like, irrespective of faction, just some music that fires up on battle start?
CBM is probably a little overcomplicated for this particular purpose, as it seems mostly intended to give factions/ships
unique, specific combat themes when they're engaged, winning, losing, or retreating. So for example if you had the Empire from Star Wars and you wanted it so that the Imperial March always played when fighting them, or if you want a custom bounty battle that always kicks off with
Zero from Ace Combat Zero, then this mod would have you covered.
If you want to just add
extra battle music to the standard randomized selection, you can coax Audio Plus into doing this without too much trouble; it already adds some extra combat music, so you just need to copy and tweak a little to add your own stuff, and remove anything you don't like. You'll want Audacity or something that can convert the music into the suitable .ogg format, then you can simply add the file data to Audio Plus' sounds.json. The process isn't that different to what you'd need to do to make music to add with this, just a bit less fiddly when it comes to setting up the .json data.