WOW--

Talk about coincidence. I'm having the same problem Philibuster describes only it's with all my whistles on the 6th note of the upper register. (and sometimes the 5th) They're not right--either I attack them wrong, or they "fall off pitch" after being correct. This is happening on all my D whistles, my low D Susato, and both of my C whistles. Since I've only got Left Index playing a note, I don't think it's a leak...

Any ideas are gratefully appreciated.

V