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  1. greetings andré ;;; MODIFY THE PITCH CONTOUR inside a pitchfield or tonality ;;; please evaluate the example and have a look to the contours ;;; subfunction (defun position-items (items alist) (loop for item in items append (position-item item alist))) ;;; function (defun compr/expand-melody (melody field &key (type 'add) (n 1) (shift 0)) (let* ((ints (loop for i in (difference (position-items (pitch-to-midi melody) (pitch-to-midi field))) collect (cond ((equal type 'add) (cond ((<= i -1) (- i n)) ((>= i 1) (+ i n)) (t i))) ((equal type 'fibonacci) (cond ((>= i 1) (+ i (fibonacci i))) ((<= i -1) (- i (fibonacci (abs i)))) (t i))) ((equal type 'summativ) (cond ((>= i 1) (+ i (+ i n))) ((<= i -1) (- i (+ (abs i) n))) (t i))))))) (position-filter (x+b (interval-to-integer ints :start (car (position-items melody field))) shift) field))) ;;; expand 1a (progn (setf seed (random 100)) (pitch-list-plot (list (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'add :n 1) (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'add :n 2) (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'add :n 3) (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'add :n 5) (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed)) :join-points t)) ;;; expand 1b => using shift (changed startposition) (progn (setf seed (random 100)) (pitch-list-plot (list (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'add :n 1 :shift 1) (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'add :n 2 :shift 2) (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'add :n 3 :shift 3) (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'add :n 5 :shift 4) (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed)) :join-points t)) ;;; compress (progn (setf seed (random 100)) (pitch-list-plot (list (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'add :n -1) (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'add :n -2) (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'add :n -3) (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed)) :join-points t)) ;;; expand 2 with fibonacci (progn (setf seed (random 100)) (pitch-list-plot (list (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'fibonacci) (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed)) :join-points t)) ;;; expand 3 summativ (progn (setf seed (random 100)) (pitch-list-plot (list (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'summativ :n 1) (compr/expand-melody (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed) (gen-sieve '(c1 c9) '(2 1 1) :type :pitch) :type 'summativ :n 2) (rnd-sample 7 (gen-sieve '(c4 c5) '(2 1 1) :type :pitch) :seed seed)) :join-points t)) some evaluations -> different melodic contours (rnd / in a sieve) and its expansions Bildschirmaufnahme 2019-05-26 um 22.04.38.mov
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