Hi Vixen,

don't know what the proper name is..... but I have made one myself from plans called "making a tin whistle with a drone."

the easy way is you take two whistles and cover all the holes in one with tape, (personally I only cover 5 so I can play minor tunes with an E drone).... then you attach the two together with rubber bands.. and play tunes as usual on one while blowing them both together..... interesting sound.....

slainte

alison