this worked:
#(define (transform m p1 p2)
(let ((p (ly:music-property m 'pitch)))
(if (ly:pitch? p)
(let ((n (ly:pitch-notename p)))
(if (= n 0)
(ly:music-set-property! m 'pitch p1)
(ly:music-set-property! m 'pitch p2)))))
m)
#(define (find-pitch music)
(let* ((p (ly:music-property
(car (ly:music-property music 'elements))
'pitch)))
p))
myPattern = { c8 d16 c d8 c d16 c d8 c d }
pat = #(define-music-function (parser location m1 m2) (ly:music? ly:music?)
(let* ((p1 (find-pitch m1))
(p2 (find-pitch m2)))
(music-map (lambda (m) (transform m p1 p2)) myPattern)))
\relative c' { \pat e g }
Met vriendelijke groet,
Wilbert Berendsen
--
http://www.wilbertberendsen.nl/
"You must be the change you wish to see in the world."
-- Mahatma Gandi
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