I was talking with @Sheri Hudgins tonight about shaping the inside of our mouths like opera singers to get a clear tone on the high notes and I was remembering the concept of "throat tuning" - ie, shaping your vocal chords like they would be to sing the same note as you're playing on the flute. Then in Improv Games tonight we explored a bit of singing & playing at the same time... So I explained and demonstrated a little bit about throat tuning. Watch this playlist for Robert Dick's explanation; try it, and let us know did it work? PS - You can watch my replay with Robert about Tone Development Through Extended Techniques here