This may be thread more for makers than players though some of the latter may understand these things. I play a Goldie low D (an “easy blower”) and love it!! Most people buying a low D want a strong fundamental and first octave, and the Goldie has these in spades. But increasingly I would like to be able to play high second and low third octaves notes that have a more relaxed and musical tone, and without having to really push them. I’d also like a slightly quieter whistle too. I’m sure Colin could make me such a whistle but I want first to better understand the dynamics.
Low whistles that are renowned for their more relaxed higher notes include O’Briain, Reviol, Lambe and Hamilton but all have high windways low backpressure and relatively high air requirements. But, according to Guido Gonzato’s “Low-Tech Whistle” page, “a short window makes notes in the second octave easier to play, while making first octave notes softer.”
My questions are two-fold. First, how do these two characteristics - low backpressure & shortened window - differ in the way they affect the second/third octaves and how do they work together? Second, if it is possible, how does one create a low D with a relaxed second/third octave but with more moderate air requirements and what are the drawbacks apart from a more sensitive bottom end?