Has anyone been successful in creating some sort of an App to control this?
No app yet, I have found I have enough of what I need with it so haven’t written one. However I have provided tons of tips here on how to control it from. Your Vera using an iTach Flex here http://forum.micasaverde.com/index.php/topic,39457.msg294710.html#msg294710
I Did hook the each zone to a virtual dimmer with PLEG so I can control them with Alexa and Veramate. I control source with scenes. Since I only control them via Vera they don’t get it of sync so never poll for state. Just assume my calls to it works.