Double Sweet Potato Ocarina in Alto C Fingering Chart

Hello!

A good while back I found a fingering chart for my Double Sweet Potato Ocarina in Alto C. It worked much better than the original fingering chart that was shipped with the ocarina. Now I'm trying to find it again but am having trouble. Can anyone point me in the right direction? I've tried learning with the included, original fingering chart but it just doesn't sound right to my ears.

Thanks!

Nate