This looks really cool
https://www.kickstarter.com/projects/1304489933/opa-multitimbral-fm-synthesizer-shield-for-arduino
only 35 euros!
I’ve cut the loops from the demo up, toped and tailed them and they are available for free from here Stream OP-A FM Synth Demo - All Loops FREE to download in desc ! by midierror | Listen online for free on SoundCloud
This is not an april fool!
I think your demo sounds great; kinda spacey, but I guess that’s FM for you. Thanks so much for sharing the loops.
The OP-A looks like fun.