what do you use

for Bb 1 and 2 i use thumb 99% of the time and then lever for chromatic stuff

on A 1 and 2 i add the G# and the right hand 1st finger on long notes (better in tune and more resonate)

for D and Eb 2 i dont lift my left 1st finger

i put down my right hand for Db1 and 2

i put down right hand 2 and 3 on high G#

and for high C i use T1234G#12