Just tried it and it didn’t work. I can still hear the hiss when arming/disarming Area 1.
I did figure out, it’s triggering VM215 when arming to “stay” mode, and VM226 when disarming. I came to this conclusion after setting it to “200ms silence” then to “500ms silence”. When I have VM215 set to 500ms silence, and arm the system, I head the hissing noise slightly longer. So I don’t think VM312 (Area 1) message is trying to play.