I have done that already, i have replaced this sirens:
0x0EA58C7C - Generic Bullhorn
0x013F5FE7 - PoliceB Main
0x17DDFB5C - PoliceB Secondary
0x0A8960B6 - FIB Primary
0x0A49B203 - FIB Secondary
0x0D329446 - Police Primary
SIREN_2 - Police Secondary
POLICE_WARNING - Not a clue.
0x0E0DA7BC - Granger Primary
0x16E74B3E - Granger Secondary
0x1C98C4D5 - Ambulance Primary
0x144C8602 - Ambulance Secondary
AMBULANCE_WARNING - Wonder what this one could be?
0x14BFBCE3 - Fire Horn
0x159C9182 - Fire Primary
0x161768E7 - Fire Secondary
But atm my ambulance, firetruk, police4, etc gets the police main siren.
What i want is that my ambulance uses the ambulance siren, and that police4 uses for example the granger siren.