When I saw the title of this vid, I was like, wow, that’s awesome. But then I watched it and the sound is well, just not that great.
It just sounds like a really pretty bland 2 operator FM synth. Get any of the 80s Yamaha PS series keyboards that pretty much all had this type of synthesis built in for around $25 on Ebay, and no need for an ipad either.
I applaud the device and hack, but don’t see anything appealing in the result.