Fortunately for me, the factory alarm uses a separate M80 piezo for arming/disarming and a the factory horn for the actual alarm, so adding the train horns were as simple as adding a relay to the solenoid //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif
If your alarm system uses a single siren for all audible sounds, you'll have to program it to silent mode or you'll wake up the neihgborhood everytime to arm it //content.invisioncic.com/y282845/emoticons/redface.gif.62fdbfe1a101588a808c4cff71bcb942.gif