should be fixed next dev

I confirm fix in 148579, but found something:

If you turn on the siren while in the driver's seat and then get out of the car, then after the player gets into this car again, there will be played two sirens

If change player's preson of view, then the '2 sirens' will be fixed
STEPS TO REPRODUCE

1. get in veh
2. enable siren
3. move out
4. get in veh again
5. off the sirens
6. after, move out

Not sure what the first video shows, but second issue is legit

wow! on dedicated server sirens still won't stop when a vehicle is destroyed

STEPS TO REPRODUCE

1. download repro mission
   T159347sirenDedi.VR.pbo6 KBDownload
2. launch arma client and dedi server, start repro mission, respawn
3. exec [cursorObject,'CustomSoundController1',1,0.2] remoteExec ['BIS_fnc_setCustomSoundController']; on any Van
4. next exec cursorObject setDamage 1

result → sound did not stop

5. deleteVehicle cursorObject will stop the sound

checkd in Dev 150658
all ok on Hosted Server and SP

Next dev hopefully

Confirm fix, on vehicle destroy siren will stop on dedi server!

1. The new issue found, for the JIP players the siren on vehcile will be off (they will be able to use UserAction "Siren on") see YT video

2. Аnd the issue from my old comment is still presents, see https://feedback.bistudio.com/T159347#2260930

3. And idk if this bug or i get wrong here, but if destroy vehicle by Van setDamage [1,false] the siren stoped only for 1 player. To repro launch my mission from above, exec [cursorObject,'CustomSoundController1',1,0.2] remoteExec ['BIS_fnc_setCustomSoundController'];. By second player exec cursorObject setDamage [1,false], result → the siren is stop for other player but not for who exec the setDamage code, see YT video

Forgot about comment above, here is 100% solution
of 2. issue with save all designed things:

1. siren sound sets (CfgVehicles) needs move from soundSetsInt[]={}; and soundSetsExt[]={}; to the soundSets[]={};
2. for each siren sound shader (CfgSoundShaders), in volume parameter, to the value need add a camPos, for interior one: (1-camPos), for exterior camPos

Check this .cpp file with done of example work to fix issue https://pastebin.com/navpYGWb

Result video shows no dpubled siren - https://www.youtube.com/watch?v=8pVGE2EH7y0

Or

info from comment above can help to find a solution in engine? Maybe problem in soundSetsInt[]={}; and soundSetsExt[]={};? Why 'auto-detect' ext or int will give bug, but 'handwritten' ext or int in volume (CfgSoundShaders) not…
Any way we now have a full way to fix issue ヽ(ヅ)ノ

Issue 2 should be fixed in Revision: 152003

Other issues should be fixed in next dev

Fixed: Siren could be heard twice when entering an ambulance while the siren is playing

still can be heard twice on dev but sound volume is much lower, see video https://youtu.be/aE-eLPtQo5I

not sure what the video shows, I tested it just now on onternal no issues

1. move in ambulance
2. enable siren
3. move out
4. move in again
5. turn off siren
6. listen carefully, set your audio volume to max, you will hear quiet siren

Maybe something went wrong with current dev build, I'll retest on new one

yes I can hardly hear it, but the controller value is 0 so it is some sound engine problem which Im not sure I can fix

If so I want to represent you solution from this comment https://feedback.bistudio.com/T159347#2635883