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Non-compensating instruments and trombones must not use the third position or valve combination because it is not in tune; other combinations must be altered drastically. Some musicians prefer to extend the tablature numbering system to 12 or more; others prefer a symbol to indicate a lesser-used, longer valve.
As the trombone in its simplest form has neither crooks, valves nor keys to lower the pitch by a specific interval, trombonists use seven chromatic slide positions. Each position progressively increases the length of the air column, thus lowering the pitch. Extending the slide from one position to the next lowers the pitch by one semitone.
On trombone, pedal B ♭ 1 is frequently seen in commercial scoring but much less often in symphonic music. Notes below B ♭ are called for only rarely as they "become increasingly difficult to produce and insecure in quality" with A ♭ 1 or G1 being the bottom limit for most trombonists.
A scoop is done by very quickly moving from an outside slide position to a close inner slide position (ex. Position 2 to Position 1), while a fall is the exact opposite motion. (inner position to outer position, ex. Position 1 to Position 2). Scoops and falls are common in Dixieland and in Swing Era jazz.
At trombone there is a picture of slide posistions and the notes played in its partial. this link , which is from my old band, takes you to where you can download a pdf file of the major scales and the chromatic scale for trombone and euphonium.
The Superbone can be played as a slide trombone, a valve trombone, or in combination. Using the slide and valves in combination requires the slide positions to be adjusted, just as when using the trigger of an F attachment on a tenor or bass trombone. Using the slide with the first and third valves engaged has the same effect as using an F ...
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The valve trombone emerged concurrently with the invention of valves in the early 19th century. Most early instruments retained the shape and form of the slide trombone, employing three valves with the tubing arranged in place of the slide; others used the new valve mechanism as an opportunity to explore different configurations while retaining the overall cylindrical bore and bell profile.