The primary key is Bb, and 9 ft in length, as well as Tenor Trombone but with a larger bore size, so the sound is heavier and softer than usually bore diameter (Bore Size) that is larger than the Tenor Trombone like 0.562 "or 0.580" and has a size of trumpet (Bell), from 9 to 10 inches are generally ½ Valve replacement key down to F and for some, there may be another Valve that can change the sound to another Minor or Major backpack 3 compilation 3 (whichever version) makes it possible to mix a variety of keys, Bb/F/Gb/D/F/G/Bb, Eb, Bb/F/F/Eb Bb/D and.Modern bass trombones are the development versions of the Tenor Bass Trombone, which was extended and the duct size, trumpet, larger later. In the past, the Bass Trombone in F key ever G and Eb as well but after the popular Tenor Bass Trombone is artificial, which can sound ranges in the past need all these trombone.
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