How do we trigger the A/V alarms based on the alarm condition our system generates?

I assume that you would like to be able to have the siren/strobe light acitvated by your existing alarm system. If you have a dry contact coming from your alarm system into a port on the sensorProbe, and the siren/strobe from another port on the sensorprobe, then yes, you can trigger activation of the siren/strobe light based on a change in state across the dry contact.