After extensive research I have finally found the siren strings for ELS and all but two siren tones are now working in-game!
They seem correspond to the OpenIV assigned names but they have the beginning part of the string added. These were all found by me personally through research and experimenting, so you're welcome (also would appreciate this being a pinned topic for others to find). From what I gather the string is basically referring to the location of the siren file in the game's archive ('RESIDENT' being the RESIDENT.rpf and 'VEHICLES' being vehicles.awc, followed by the siren name). Strangely, the siren names identified by OpenIV for the main LSPD tones and the Sheriff Granger tones don't work so I will need help with that. Anyway, enjoy!
LSPD Main Police Siren:
"VEHICLES_HORNS_SIREN_1" - Police Primary
("RESIDENT_VEHICLES_SIREN_PA20A_WAIL" doesn't work for some reason)
"VEHICLES_HORNS_SIREN_2" - Police Secondary
("RESIDENT_VEHICLES_SIREN_2" doesn't work for some reason)
Siren Warning/Priority Tones:
"VEHICLES_HORNS_POLICE_WARNING" - Police Warning
("RESIDENT_VEHICLES_POLICE_WARNING" doesn't work for some reason)
"VEHICLES_HORNS_AMBULANCE_WARNING" - Ambulance Warning
("RESIDENT_VEHICLES_AMBULANCE_WARNING" doesn't work for some reason)
"SIRENS_AIRHORN" - Airhorn
("RESIDENT_VEHICLES_AIRHORN_EQD" doesn't work for some reason)
"VEHICLES_HORNS_FIRETRUCK_WARNING" - Firetruck Horn
("RESIDENT_VEHICLES_FIRE_TRUCK_HORN" doesn't work for some reason)
My three requests are:
1. Why are a few of them not working, particuarly the Sheriff Granger ones? Could someone with knowledge help?
2. Can we get an AI Sirens mod that makes the AI change siren tones based on the vehicle's VCF siren setup?
3. Is there any way to remove the pitch filters that are applied to some of the sirens? (e.g. the ambulance and fire truck sirens in-game are lower pitched than the actual file itself)