Just a few ideas.

[SashaIndustries]

Would it be possible for songs to play under multiple flags with set priorty?

So as an example.
Biome.Ocean,Underwater
Or
Biome.Deep+Ocean, Below 50Y
Or
Biome.Deep+Ocean, Health below 10

While also being able to have priority so no matter what happens I could set it so the low health music kicked in over anything else so long as the biome, depth and other conditions equals true.

Also anyway for the mod to understand what is to be layered and what not to be layered so classification between "Music" and "Sounds" "Voices", something like that so certain sounds could play during music and sounds wouldn't have the fade at the beginning to add more flare to mods that are lacking in sound immersion.

Another idea I have would be to be able to set a custom item, entity, block that the mod would look for similer to it knowing when there are more then a set amount of animals nearby but instead of that something that could be specified.

So as an example
biome.deep+Ocean, Y=<30, Block.Fire=10>:Radius=10, Block.water=20>:Radius=10 = Music.DeepWaterBaseFireSpreading

So it would check the player was in the biome Deep Ocean or Abyssal Depths as an example
Then check they were below a certain level as in my mod pack I have it so you need oxygen and fire eats it.
It would check for more then 10 blocks of fire in a radius of 10 from the player.
Would check for water so the mod could play the appropriate music for possible oxygen loss.
Would trigger in an environment where a fire has broken out inside a small area of the base.

Also if I was to have vehicles or turrets anyway for it to trigger a sound from the turret itself when a certain item reaches a certain value? So example
Block.Gun+Turret:Inventory.Item.Bullet=<30
So I can create sort of a more sci-fi system or even make it check for a specific kind of block in the area so as an added condition it would only play that if it could find a speaker block and computer terminal block in the nearby area so slimier to its already preexisting ability to find a specified number of animals.

Also anyway for it to mark generation of objects so ruins and things like that automatically and citys from other mods?

Last and least anyway for it to search for values to do with a block. I am highly doubtful as I myself do not have much knowledge of the workings but wondering if a vehicle had health or if a furnace was smelting if it could look for that perhaps the animation that the block is on or something or a value.

Just a few ideas mostly sorry if its a bit messy hope it might give some good ideas.