I just published this gem called Zoney (http://github.com/kenyonj/zoney) that will control the monoprice 6 zone amplifier. I'd love to get something like this controllable through hubitat. There was a ST app for it, but it wasn't really working for me. I also have a REST json api that I have in development and would be happy to work with anyone to get this going.
Let me know what you think