Same as B-natural. 7th position in the lower octave, 4th in higher octaves.
It's B natural 7th position or slightly-flat second with trigger on a tenor trombone, or any Bb (B flat) pitched trombone.
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You ask to play a "trigger b flat?" Let's assume that you are asking, "How do I play a Bb using the F-trigger on a trombone?" My first answer would be, "Why would you even want to? Bb is first position without the use of the trigger." But, if this is purly experimental, remember that the low C is played with the trigger and the slide at slightly "flat first" position. B is "flat second"...so it figures that Bb would follow at "flat third" position. The Bb on top of the staff would be played in third position since C is in first position.
There are a lot more per position than you have listed here. You must include C (above Bb), even high Eb. Every Bb is playable in 1st position, every F 4th line (BC) & up, etc __________________________________________________ 1st position: Your slide is not out at all. Notes: B flat, F, B flat, D, F 2nd position: 2-3 inches out. Notes: A, E, A, D flat E 3rd position: About about a centimeter closer to you than the bell: Notes: A flat, E flat, A flat, C, E flat 4th position: About a centimeter FARTHER than the bell. G, D, G, B, D (I think!) 5th position: About 2 inches farther than 4th. G flat, D flat, G flat, D flat (I think) 6th position: A little tiny bit (one inch or so) farther than 5th: F, C, F, C 7th position: Unfortunatly I never use this position so this may not be very accurate but using the info above. It's about 1 inch farther than 6th. Notes: B, E flat, B
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Other words for 'flat' are... even, level smooth, equal.
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It works here in Georgia, if the surface is flat and smooth.
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It means smooth, or flat
A rat terrier is the breed. Smooth is the coat - Flat/ short. You can also get Wire. Its the same dog...
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The flat surface felt smooth.
E-flat is 3rd position.