The Onkyo SC5508 does have 12v trigger operation for main room, zone 2, and zone 3. I am not sure about the TX-NR3009.
Bill
I called Onkyo about triggers before and they told me that they do not have any receivers that triggers can be assigned to your main zone. You may want to double check with them, but those assignable triggers may only work in zones 2 and 3.