Does anyone know how to change the ELS setting where you can sound the air horn while the siren is still going? If you don't understand, please tell me. I will try to be as descriptive as I can.

when your siren is on hit the Y key and that makes the Air Horn sound! This can be done when the siren is on or off!

when your siren is on hit the Y key and that makes the Air Horn sound! This can be done when the siren is on or off!

 

I know that, but I want it so that when the siren is playing, I can sound the horn without the siren stopping.

theres no way to do that! However thats how a real car works! When you sound the horn it stops the siren unless you have dual sirens

theres no way to do that! However thats how a real car works! When you sound the horn it stops the siren unless you have dual sirens

 

How do you get dual?

it wont happen in gta 4, i said a real car when you have the dual sirens

You can have dual sirens.  Press the button you have set for the manual siren. While holding it down activate the siren and you should have dual tones. Press the key to scroll through the tones to changes. wail/wail wail/yelp, etc.    

 

Also if you change the keys to active your sirens via els while they are active if you press G or the siren button on a controller the horn and siren will sound.