I've just had a wonderful first day exploring my new Coda. My sound wasn't very good till I stopped and studied the flute for a while, and finally appreciated how the two chambers are arranged, and which holes control which octave. I was blown away by the solution Karl has come up with. Karl, knowing the goal is to completely cover the pair of holes every time, it might help lower beginner frustration if you would explain the arrangement a little, so we would know where to look for leaks. I would also love to hear some of your story of early development of the idea and prototypes. Thanks so much for your years of work, I hope you're amply rewarded in many ways.