[X-boxman37]

I have just purchased Grand Theft Auto San Andreas for x box and I don't know how to activate or deactivate sirens in emergency vehicles it is real annoying when I steal a cop car and the siren is on and I can't turn it off the previous versions of this game you just hit the left thumb stick. When the siren is off all that happens when I hit the left thumb stick the horn honks.
I sure could use a answer in this matter.

Thanks
Xboxman