Hi there
I’ve just ordered a ’ Whisolo ’ from David O’Brien. It’s essentially a piccolo flute with a whistle headjoint. Can’t wait to get my hands on it and get learning some folk repertoire. Any other Whisolo players on this forum? 
I can’t see many videos of people (other than David himself) playing it on YouTube - so when I get hold of it I will do a video review for you all !