This is why I LOVE this forum, enthusiastic conversation without the nonsense, thanks guys!
Whistling is like blowing over the top of a bottle or a flute and is known as a Helmholtz Resonator which is different to a stopped pipe like a trumpet so the science is slightly different but that doesn’t matter… we are talking about sensation and YES @eckleberg there is much merit in being able to do it.
This whole whistling thing has been mentioned several times in the last month. I think that if there is a whistling sound in the mouthpiece, there may be a tiny bit of resistance at the lip however if you are getting the Sympathetic Oscillation on the leadpipe, then it is of no concern.
I will start week 2 of #wihsc with some whistling so tune in.