Hey guys, we are after minimal movement; no movement is impossible. The Low C to G partial is the biggest interval on the horn being a 5th, more than 1/2 an octave!!! 🙂 There has to be changes or the notes would not change. People have this idea that the jaw should not move AT ALL, this is simply not right. Are you all signed up to the WindWorks Members Facebook LIVE group? We have a live Q+A in session in 40 minutes. Join here https://www.facebook.com/groups/273514453241915/ Cheers, Greg