Hey I'm play a four valve yamaha tuba. I was just wondering if anybody can play a pedal Bb. I can do what should be a low B natural if you use all the valves cause ive done the math. I DONT mean the Bb that is only two ledger lines below the bass clef i mean like 7 or 8 lines or something like that like the lowest Bb/A# on a full size piano. If anybody knows how to play it that would help.