my teacher demonstrated subtones on his alto.
But imho the tenor is the beast to play subtones, i’ve not heard soprano sax players using subtones, probably not as effective on those high pitches.
Thanks for sharing, i play alto and i’ll give subtones a miss.
If i wanted to play all the time with subtones then i’d take it seriously, but for the odd tune and changing my setup and embouchure makes it highly unlikely for me to go down that route.