DUO
Instruments- discuss specific whistle features, brands, tweaking, problems, questions
That sounds pretty! Looks like you can use one side for a drone note while playing the melody on the other side- but you can switch those back and forth sometimes. Cool.
I have one of these wooden double ocarinas from New Zealand... they are beautiful and not cheap. Sadly, I have not gotten beyond playing a few unstructured spooky note pairings on mine. It sounds lovely, but requires more breath force than I am good at:
"https://www.youtube.com/watch?v=EZylfsDGOOo&ab_channel=StefanDollak"