to bridge the gap from mode 2 to mode 3 (a fifth)
requires 7 slide positions Bb-A-Ab-G-Gb-F-E
how long should I make the trombone if I can extend arm by 0.5 m?
Answ: no longer than 3 m when slide is extended -> 2m for pos 1
one method: the slide (trombone)
Playing a chromatic scale (sequence of half-steps):
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