I mentioned that might be a possibility to someone else stig, do you think you could give the mission.sqm way a try? As I said, I'm still learning, and locality can be confusing - so maybe calling via init.sqf is no good?I call it through init.sqf so maybe why sound not being called??
stig, I'm also just now going to update the random bombing script (no chopper, no ai) so it gives proper information about where the sirens are being created, the bomb sounds and the bombs. Give me like 20 mins or so and I'll post it here, and update the OP with it, just smoothing out a bug where something isn't showing its location.
One last thing, I said no requirements, but I'm not 100% as i've never installed it alone on vanilla. It may need something else I've changed somewhere, I've just set up a couple more local server instances to test on, so I will report back if I find anything.