Power & Source of Big Ideas

I'm new to NanoPI. I've read several places on the FriendlyARM sites that there is a Debian image for the Fire2a. Yet all I get, from the download page, are the LUbuntu, FriendlyCore and Android images. The two Linux images are ginormous, they'll take a while to strip down. I'd like to try the Debia...
I'm new to the NanoPI line of hardware. I received a Fire2a for Christmas. Before I dug too deep into its guts I was wondering what people were doing to get sound out of it. Using the "FriendlyCore" image it shows there are two sound devices recognized. I assume that one is the HDMI output...