I tried that and was successful, but it is limited by the type of explosion and I wasn't sure how to add event-specific sounds in addition to the awesome ones you have already. For example, I love the napalm artillery mod too but the sounds aren't appropriate for that type of explosion - further, I'd love to have normal artillery make a more resounding, chunky explosion but I just can't figure out how to add it!
What I tried to do - unsuccessfully - is to use the orbital ion cannon's explosion sound to function when only the OIC fired. That was the first thing I tried to do in order to test my thought and I had zero luck!
If I could just figure out how to script an action to play a noise hahahah! Thanks for all your communication, it's been super nice chatting with you about this and I appreciate the dedication!