A long time ago, two Canadians teamed up to create a Scottish harmonica. Bernie Brey and Andy (Paskas) Dallas. Bernie mused one day that it would be nice to have one, but Andy made it happen. He was very clever.
He made one of these for me in return for my recording him playing his original tunes on an old TEAC open reel deck. He started with a 64 CBH and tuned the blow notes in the second hole so they were the same as the blow notes in the third hole, G and G#. So the first and second holes were a fifth apart, the interval of a drone. He fed air into these two holes from, yes, a large balloon. Through a PA the sound is unbelievable. Over the drone you can play any diatonic tune. I always played Amazing Grace.
Andy also made for me a Swiss harmonica (it yodels by itself); an Italian harmonica (it sounds like a mandolin) and a French harmonica (can be played with or without tremolo). These three are all based on the 270.
Andy was cantankerous and stubborn, nearly impossible to get along with, but a rare combination of musician and mechanic. A real Canadian, he did all of his custom work while lying on a bed watching hockey games. Powerfully built and energetic, he had the patience of a saint when filing reeds. He is probably buried with his oscilloscope.