I’ve seen several flutes with 8-holes, the two extra holes being vents (or impossible to finger notes) that allow the flute to be longer.
Do any whistle makers do this? It seems the extra length would make sounding the lowest notes a little easier.
I’ve made af few low D whistles from PVC and they all seem to work but it’s really hard to get that lowest note.
Also, can the "flutomat" be used for whistles? Where would the embouchure measurement be?
I’d like to try to make some whistles from found objects and flutomat seems to have enough variation to use just about any tube you can find.