last night i played on another tenor saxophone, a selmer sa80 III, and it was much easier to hum and blow the tones . Even the Bb3 worked.
I don’t want to blame my Jupiter Tenor and praise Selmer for being responsible for that. Maybe on a cheap chinese horn i could even do better. I only want to say that a hardware change could sometimes manage it.
I looked into your growling demo. Very nice. Maybe i didn’t catch all, what you said there, but you didn’t tell something about changing the hum pitch. Maybe its not needed. đ