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Thanks for the old version of the Object Spawn Unlocker mod. Half of my map mods didn't spawn because the newest version of that mod is not working anymore! This version really helped me out. Otherwise I needed to install Menyoo trainer. And I'm not a big fan of installing a bunch of other stuff to just unlock these objects..

Doesn't work. Probably a long time not supported by all the new versions of Scripthook anymore.. The log tells me it the ASI fails to load. Objects are not visible, half of maps will load, and the other half is invisible.

It helped me to install Menyoo trainer. Then the objects would be visible. Maybe Menyoo contains some kind of unlocker as well, but I'm not a fan of installing a whole trainer just to unlock the objects..

@Smitten Thanks, I will try it soon. Do you use the "Object Spawn Unlocker" ASI mod? That one is not working for me, and maybe so some objects wouldn't spawn because they are blocked? And maybe, Menyoo fixed this because Menyoo would unlock these objects as well, idk.

Will try to re-install map editor again.

I seem to have problems spawning the objects for this map (and other objects tho). Half of the villa is invisible. Installed all the requirements as mentioned. Everything up-to-date. Apparently I had also to install Menyoo trainer to get the objects to spawn via Map Editor.

After installing Menyoo, I was able to load almost the full villa. Except some lights are still floating in the air.. I'm not a fan of installing all kind of trainers to get some spawning to work. I think something is buggy with my game as YMAPS are not showing up as well.

Nothing bad with the map itself I guess, it's just that some objects are invalid, unless installed all the requirements. No idea why Menyoo would fix this (partly), but it is for some way..

As some people like @Aurora11 mention, it looks like the hashes for the sound files are invalid.

I've searched the entire vehicles.awc and extracted .oac folder to search one by one for all parts of sirens, to get the right hashes to replace with.

I found the following:

airhorn: AIRHORN_EQD.wav
ambulance warning: AMBULANCE_WARNING.wav
fire truck horn: FIRE_TRUCK_HORN.wav
siren 2: SIREN_2.wav

siren firetruck quick: SIREN_FIRETRUCK_QUICK_01.wav
siren firetruck wail: SIREN_FIRETRUCK_WAIL_01.wav
siren police main: SIREN_PA20A_WAIL.wav
siren quick 01: SIREN_QUICK_01.wav

and so on..

So replace the above files with your favorite siren sounds.

But.. When I was trying out all the original siren sounds, it seems that there are already original sirens which sounds more modern than the default GTA one? Like siren_03 and siren_04 contain some different sirens I have never heard in GTA before. Apparently, siren_04 would be used for the bike police, but actually never heard the _03 one. What I did was just changing siren_03 and/or siren_04 sound files for the SIREN_PA20A_WAIL.wav file. The default siren would then sound a lot better ;)

If someone knows where siren_03 and siren_04 are used in GTA V, please let me know, as I'm very curious now! Maybe I missed something.

You could also edit these sound files yourself, for example make some tones higher or speed it up a bit with a sound editor.

Good luck!