The Double Buzz.

[darkmortality]

I have never had a double buzz.

[skaterdude275]

I use both upstream and downstream but mostly downstream but I've never had the double buzz problem .-.

[falloutboy7778]

I am a tubist and i dont play mainley downstream or up stream in my lower register up to about a high C or D, on a BBb tuba, i just upstream and switch to upstream for higher notes.

[galexander4]

Wow - this is awesome! This is going to really make me think a lot when I next pick up my trombone!