Can you do this at speed though, great speed? Listen to Klezmer.
Thats the the good thing about a Bingamon tailor made whistle.
Even a beginner will be able to be at it at speed.
Yes I have one with the extra C hole. It is fun to mess about with and sounds very eastern but it is way out of tune and not in any consistent way. I have had it for some time so they may be better now.
Supposedly tuned to:
C, D, Eb, F#, G, A, Bb, C, D
The A is somewhere between A and Ab and curiously the second C (all holes open) comes out as a B. Maybe if I blow harder …