I haven't tried it yet, but in contacting outlaw directly they suggesetd that I connect my main zone amp to trigger two and program trigger two to activate for all sources. Thus, whenever the 990 is powered on for the main zone, trigger two will activate the amp (but turn off when only zone 2 is on). I have a separate distributed audio system for my other zones and only use the 990's tuner for zone two and thus don't want any amps triggered when zone 2 is active in the 990, but you could connect a zone two amp to trigger one and it would stay on when zone 2 is active (but also be active when zone 1 is in use).