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Explode music "handbell choir" style?

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Hello!  I am trying to solve what is probably a simple problem.


I would like to take a single line of music (or two) and explode it to a set of instruments that each only play 1 or 2 pitches.  The rhythmic position of each note needs to be preserved, so for example:

q c4 d4 e4 f4

exploded to four instruments that play [c4, d4, e4, f4]

gives me four staves:

q c4 -q -q -q

-q q d4 -q -q

-q -q e4 -q

-q -q -q f4


This is like a handbell choir.  I need to be able to specify how many instruments and what pitches each of them are responsible for.  I would love to be able to go the other way too, and implode to a single staff.


Any ideas about how to approach this?




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Here it is:

(pitch-mix '((c4 d4 e4 gb4) (c4 b3 gb4 c4) (c4 b3 g4 ab4)))
=> (c4 d4b3 e4gb4g4 gb4c4ab4)

(pitch-demix 1 '(c4 d4b3 e4fs4g4 gb4c4gs4))
=> (c4 d4 e4 gs4)

(pitch-demix 2 '(c4 d4b3 e4fs4g4 fs4c4gs4))
=> (b3 fs4 fs4)


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