output 1 is the only output that talks. If you want to make it speak in different areas of the house, then you will need to use relays to route output 1 to different speakers.
for example, you may want to have an interior speaker that is directly connected to output 1 so that it always talks. then have a second outside speaker connected inline with a relay to output 1. when you want to hear any announcements outside, use an elk output to activate the relay.