Glad you added that bstrom. I will try it. The F# fingering you use is what? Fingering I use is LEFT HAND: finger1, finger 3; RIGHT HAND: finger1, finger4 on the D# and yes I hold down the octave key. The result is a clear, fast speaking, steady and singing F# that can take a lot of air or a little. Sweet.
Okay......just tried both your suggestions. As regards high G, at least on my 10M, I must hold down the octave key, else high G dissolves like cotton candy in a blowtorch.
The result for F#, however, is like bullet proof. It doesn't matter whether I use the octave key or not. So that's a discovery. Thanks!
I've one other 10M issue, but will start a thread for it.