Followed by some mentioning of taborpipes, and having no idea of what tabor pipe is, I made little research.
And stumbled upon Flageolet.
What a clever idea! What a beautiful instrument. Double Flageolet is what I was looking for some years ago.
Now, looks like Double Flageolet was designed to play in thirds, but I haven't researched the whole library yet. Playing in thirds would have been very boring on Concertina, but appealing on a flute.
Anyways, take a look at this and judge for yourselves.


http://www.flageolets.com/music/

Neat find-- I'll have to try some of those tunes on a concertina. I have a folk instrument my wife brought back from Israel a few years ago which has two pipes with reeds cut from the cane the pipes are made from which would be played like a double flageolet. I've also seen native american flutes played like a double pipe-- one in each hand.

Thanks for the link.

You're welcome.
Now I know the name of those cool medeaval double recorders. Looks like they were wide spread.
19 century flageolets had sponge between the fipple and the sound slot (whatever it is called), so uneven breath of the player would be evened out. It probably meant less control over the sound, but the sound was evenly acceptable.
I'll give it a shot myself.

Tabor is the small drum ( as in tambourine, bodhran) and pipe was a three holed flute. Both held in the left hand and tabor played witha stick in the right. Widely used before fiddle and later instruments and in Morris Dance must have influenced later styles on fiddle, concertina, melodeon.