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rewrite-dyn function

Featured Replies

Hello, Opusmoders

This is a very cool and easy to use function to rewrite dynamics.

Check it out. Hope you like it !

Best,

Julio

(defun rewrite-dyn (expressao-omn dynamic-list)

"Substitui as dinâmicas de uma expressão OMN por uma lista customizada,

fazendo a rotação cíclica se a lista for menor que o número de notas."

(let* ((dis (disassemble-omn expressao-omn)) ; [2, 3]

(pitches (getf dis :pitch))

(lengths (getf dis :length))

(articulations (getf dis :articulation))

;; 1. Mapeia a estrutura de cada sublista (quantidade de notas por compasso)

(counts (mapcar #'length pitches)) ; [6]

;; 2. Calcula o total de notas para gerar dinâmicas suficientes

(total-notes (apply #'+ (flatten counts))) ; [7]

;; 3. Cria a lista plana de dinâmicas repetindo o padrão do usuário [4]

(flat-vels (gen-trim total-notes dynamic-list))

;; 4. Redistribui as dinâmicas na estrutura de sublistas original [5]

(structured-vels (gen-divide counts flat-vels)))

;; 5. Remonta o objeto OMN completo com os novos parâmetros [3]

(make-omn :pitch pitches

:length lengths

:velocity structured-vels

:articulation articulations)))

;; USE

;; Exemplo 1: Dinâmicas simples

(setf expressao-omn '((s eb4 d4 e a4 -s s eb4 tie) (h eb4 a4 -s eb4 d4 -s tie)

(e. d4 a4 eb4 d4)

(-q e f4 s c5 qs fs4)))

image.png

(rewrite-dyn expressao-omn '(p mf ff))

;; >> ((s eb4 p d4 mf e a4 ff -s eb4 p tie) (h eb4 mf a4 ff -s eb4 p d4 mf - d4 ff tie) (e. d4 p a4 mf eb4 ff d4 p) (-q e f4 mf s c5 ff qs fs4 p))

;; Exemplo 2: Incluindo crescendos

(rewrite-dyn expressao-omn '(ff > p p< ff> pp ff p p< ff p mf ppp p < ff))

;; ((s eb4 ff d4 > e a4 p -s eb4 p< tie) (h eb4 ff> a4 pp -s eb4 ff d4 p - d4 p< tie) (e. d4 ff a4 p eb4 mf d4 ppp) (-q e f4 p s c5 < qs fs4 ff))

image.png

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