i think Dialogue sounds (i.e : Build voice, attack order, Pirate raiders have left there base, planet module complete) all have priority to the current sound playing. no voices "stepping" on each other.  if an event sound is playing wile your corvettes build sound ques, it will not play. nor will play after current sound is finished. it just skips it.

i think explosion sound layer up to 5 and the have priorities.  hope that helped

i have found it a bit bummer when i miss "one of our planets is under attack, our,  pirate raiders are attacking one of our planet" due to another race event sound playing. i think event race sounds don't step on each other because they use mostly one voice actor per race. they would sound like there studding. i combined all 3 event race voice sounds into one   ( Vasari for the time being ) it helps a lot with not tuning event announcements out and far less mechanical sounding.  ill try to figure out how to get the event sounds not "step" on each other. that would be real helpful

Ah - that's what that new sound is!! Was wondering about that...much better than hearing corvette announcement over and over.

And we say the devs don't listen...

Shows what I know...

Yeah, they fixed it.

A giant shockwave has rippled phase space!