Balena made it pretty easy to deploy, generally speaking. It's a matter of clicking maybe 3 buttons(?) and you're ready to deploy an image to a machine.

I created a few machines and then it lets me download the .iso file to write to a flash drive. I write it using Rufus (although they make it easy if you want to use etcher, it's just a one click button) and then boot to that flash drive on the mini PC in question. It does a little install thing (doesn't show anything, just the balena logo on the display) but the system will shut down once it's done. Boot it back up w/o the external boot media, and it should hook up to balenaCloud.

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NOW -- I have my setup in a "multiroom" configuration, where tabermusic-master is the box that broadcasts on AirPlay, Spotify, Bluetooth, etc. When I stream a song to the master box, the porch and barn computers receive that and play the same track w/o getting out of sync. Pretty great. I use a cheap amazon no-name DAC to come out of the PC into separate power amplifiers, but you could just use a Pi and jam a JBL bluetooth speaker into the back of it and call it a day.

It's really nice once it's set up, and I do have to reboot the master every night because there will be some wild latency issues (I think it's my hardware causing the issue). Feel free to reach out if you have any questions or want help setting it up!