Dear All,

An useful function do make various pitch-demix operations at once.

(defun poly-demix (n-list mat-omn)

"Extrai as vozes especificadas em N-LIST de uma sequência OMN

e as combina em um único fluxo polifônico."

(let* (;; 1. Garante que n-list seja uma lista e extrai cada voz

(extracted-voices (mapcar #'(lambda (n)

(pitch-demix n mat-omn))

(list! n-list))))

;; 2. Aplica merge-voices sobre a lista de vozes extraídas

(apply #'merge-voices extracted-voices)))

(setf mat-omn '((e. g2bb3d4f4a4 mf s -e e c4c5c5 e. g2bb3c4d4f4 s g3g4g4 -s s g2bb3d4f4a4) (q bb2db4f4ab4c5 mf -e e bb3bb4bb4 e. eb4eb5eb5 s ab3ab4ab4 -s s bb2db4ab4c5eb5)))

(poly-demix '(1 2 5) mat-omn)

((e. g2f4a4 s -e c5 e. g2d4f4 s g4 - g2f4a4) (q bb2ab4c5 -e bb4 e. eb5 s ab4 - bb2c5eb5))

Best, Julio

@opmo IMHO the functionality to demix multiple voices is highly valuable and deserves to be added to the standard library.

Maybe a slight suggestion (see :sort nil):

(defun poly-demix (n-list mat-omn)
  "Extrai as vozes especificadas em N-LIST de uma sequência OMN
e as combina em um único fluxo polifônico."
  (let* (;; 1. Garante que n-list seja uma lista e extrai cada voz
         (extracted-voices (mapcar #'(lambda (n)
                                       (pitch-demix n mat-omn :sort nil))
                                   (list! n-list))))
    ;; 2. Aplica merge-voices sobre a lista de vozes extraídas
    (apply #'merge-voices extracted-voices)))

Hi Julio, I am trying to write a samba pattern for guitar in omn. I wanted to get your opinion on how might you tackle this sort of task.

Here is the best I could come up with.

(setf chord '(e c3 mp tie q c3g3b4e4 e g3b4e4 stacc q c3 tie g3b4e4))

; (setf samba-rhythm '(e q e q q))

Any tips would be much appreciated.

Thanks,
Vani

Dear Vani,

I recommend this book: Brazilian Guitar Book, by Nelson Faria.

You´ll learn a lot about brazilian rhythms and different styles of samba.

https://www.amazon.com.br/Brazilian-Guitar-Book-Nelson-Faria/dp/1883217024

Also This one:

https://www.amazon.com.br/Ritmos-Brasileiros-Pereira-Marco/dp/8561011009

Best,

Julio

https://youtu.be/Ni8aFZgCgY0

Love the video.

Jesper

awesome, I own the nelson feria book and I really enjoyed it. I am interested in getting better with omn and wanted to see how you would approach the concept. thanks for sharing. I also loved the book combinatorial harmony by Julio Herrlein. ;) good stuff!

Cheers

Thank you very much !