Jump to content

Featured Replies

Posted

Hello!

 

 

 

Is there a way to do a simple conversion from integer (representing scale degree) to pitch (via a Tonality)?

 

map-to-tonality assumes that the integer input is a chromatic pitch class.

 

Thank you!

Elliot

 

 

also you may be interested by this example:

 

;; An example of diatonic transposition
;; ie. using tonality degree for tonality mapping.

;; degree selection 
(setf degr '(1 4 2 5 1 6 4 2 5))
;; remove 1 from each degree for use as transposition
;; inside tonality for diatonic transposition
(setf trsp (mapcar (lambda(x) (- x 1)) degr))

;;; some material

(setf arps1 (gen-repeat 
             (length degr) 
             '((s c4 e4 g4 c5 e5 g5 c6 g5 e5 c5 g4 e4))))

;; apply diatonic transposition (inside tonality) 

(setf arps.map (tonality-map 
                '(major :root d4)
                (pitch-transpose
                 trsp
                 arps1)))

SB.

 

  • 4 weeks later...
  • Author

Neither of these do quite the simple conversion I'm asking.  (integer-to-pitch) only speaks chromatic pitch-class, not diatonic scale degree.  I may not understand the second fully yet, but a more transparent test shows its limitation:

;; An example of diatonic transposition
;; ie. using tonality degree for tonality mapping.
;; degree selection 
(setf degr '(1 2 3 4 5))

;; remove 1 from each degree for use as transposition
;; inside tonality for diatonic transposition
(setf trsp (mapcar (lambda(x) (- x 1)) degr))

;;; some material
(setf arps1 (gen-repeat 
             (length degr) 
             '((s c4 d4 e4 f4 g4))))

;; apply diatonic transposition (inside tonality) 
(setf arps.map (tonality-map 
                '(major :root c4)
                (pitch-transpose
                 trsp
                 arps1)))

 

The result is

C D E F G

D F G G A  (when a true diatonic transposition would be D E F G A)

D D F G A (should be E F G A B)

etc.

 

I'm getting a handle on LISP and think I'll be able to write my own function, but I do suggest that this is basic musical task that many people would use if it were in the library.

 

Thanks for your help,

Elliot

Create an account or sign in to comment


Copyright © 2014-2025 Opusmodus™ Ltd. All rights reserved.
Product features, specifications, system requirements and availability are subject to change without notice.
Opusmodus, the Opusmodus logo, and other Opusmodus trademarks are either registered trademarks or trademarks of Opusmodus Ltd.
All other trademarks contained herein are the property of their respective owners.

Powered by Invision Community

Important Information

Terms of Use Privacy Policy