Virtual audio volume - Alexa

Short version - I am trying to expose the Virtual audio volume device on Alexa, but I am not having much luck. Before I punt and just use a dimmer control or such, has anyone else done this?

Back story - I am playing around with the API for the Arylic DIY WiFi audio boards. I could spend a week learning Amazon Developer (which I really don't feel like doing). Instead, I intend to create virtual controls that will be used to pause, resume, set volume ... maybe more. Sending the POST commands via webCoRE seems to be working well, albeit with some delays.

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