alt Hacker NewsHi, Ocarina maker here! This is a genuinely interesting idea, and some Ocarina like the Goslings do have a double keying with a single finger.
Sadly with English Vessel Flutes (4/6/8 holes) the holes need to all be roughly equidistant from the center of the chamber, which makes a two finger setup ergonomically complicated while keeping a tangential fipple. It is also very desirable to use the pads of the fingers to cover the holes, making a good air seal is tricky with the middle of the finger. On ergonomics, it is also worth mentioning some Ocs get quite big as well! My largest 6 hole is almost 300mm wide, my fingers are not quite long enough to span this...
Hi, I have made quite a few "Ocarinas", but not designed for musicians, but rather curio collectors. I started to look into making well tuned ones, but for the place and time i was in, it did not seem worthwhile. I am getting ready to get going with clay again, and I might give tuned ocarinas a try again. Would love to see your site if you have one. Here is a picture of some of the ones I made: http://zafka.com/w5.html This next page shows some stages in making them, nothing to do with the actual sound making. http://zafka.com/fish_photos.html