Easy! Go ahead and finger bottom Bb, then with your left hand pinky trill to B.
Not so easy, eh? Maybe you got a bit smug because now you can do the altissimo trill F to G.
But the Bb to B trill is impossible in most cases without knowing this nifty little trick, or having a bionic pinky finger in your left hand.
Sadly it won’t work on instruments with bell keys on the left, which includes vintage Conns and Bueschers. 🙁
So without further ado, here it is – the moment you’ve been waiting for = the Low Bb to B trill
Which saxophones can I do the low Bb trill on
It should be say enough on any alto or tenor with bell keys on the right, and depending on the size of your hand and fingers the trill works well on baritone saxophone.
It will probably be impossible on a straight soprano, as it relies on the bell keys to be close enough to your right hand, but should be OK on curved sopranos.