The latest bizzaro offering on Ebay:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2538953675&category=308
It’s kinda neat with the twin windows and dual tubes. It kinda makes me wonder how it’s played? Do you play constant double stops? Do you drone on one side and play the melody on the other? Do you play just one side at a time and ocassionally double stop?
Anyone see something like this?
PC
Looks like some kind of dvoyanka, maybe?
These are sh*te!
Do not bother with one.
I work in a ‘charity shop’, that collects unwanted stuff, and recycles it,
sells it/donates it etc for environmental fundraising purposes.
Now and again somebody brings various musical things in, which always arouses my interest, and one day a woman bought in a load of these things, various quena type flutes, and several whistles.
Everything worked, except these double whistle ‘things’.
Not one of them many any sound that altered by closing the holes, and some made no sound at all.
They are a ‘catch penny’ posing as an ‘ethnic/native’ product.
They may be native or ethnic, but musical instruments they aint!
Save yer money.
Sorry to bear bad news.
HTH
ED Fool,
No fear! I wasn’t going to buy the thing (it looked a bit too crude to have much of a chance to function…let alone well!) I was more interested in the idea and after what fashion the inspiration for the whistle was played. I still think it’s cool…if only in concept.
PC
PS–Thanks for the warning though!
Typically. And the decorative carving looks too authentically Carpathian* to me for the instrument to be totally unplayable. Now the scale may be a surprise.
For references, see http://home.att.net/~bandura.ca/VMfolkBook/index.html
And this interesting fingering chart for a double Hind 
ocarina, tuned to perfect 5th : http://hindocarina.com/Fingering_Charts/Hind%20Double%20Ocarina.htm
Finally, remember all the Classic Greece illustrations of V-shaped double pipes, which seemingly were fingered like two tabor pipes.
If most bagpipes if not all have drones, I don’t see why whistles wouldn’t benefit from one, or why they’d have to stay monodic.
Nanohedron is correct on this one,but used the phonic spelling of Dvoynice. The instrument is called a Dvojnice or Frula and is native to the Former Yugoslavia and Turkey. This instrument usualy uses the Middle-Eastern/Turkish scale with different intervals between notes than a western scale. This scale is not “wrong”, just different. It is also played in ensembles with the Kaval and the Fujara
Dvojnice photo
http://www.uzice.net/suveniri/img/dvojnice.jpg
Kaval photo
http://macedoniadirect.com/music/instrum/images/kaval.jpg
Fujara photo
http://www.ecosystems.sk/images2/fujara_m.jpg
Aha.
I feel it’s safe to say that as my original source for the word -spelling and all- was a Lark in the Morning catalog, perhaps 'tis 'nuff said. 
Not to nitpick, but I did a search and found a number of sites that present the dvoyanka as a Bulgarian instrument, dvoyanka apparently being the Bugarian cognate for dvojnice. A couple of sites have an interesting take on English, of course. 
One really cool instrument is the gadulka, and is uncannily like the Indian sarangi except in its shape: played upright in the lap, has sympathetic strings, and the melody strings are stopped not by pressing down with the fingertips but by using the surfaces of the fingernails (sorta like slide guitar). That floored me. I presumed the sarangi to be one of those uniquely Indian approaches to a concept. I wonder how many other cultures have fiddle-style instruments played in the same way?