Easley Blackwood
In the Western 12 note scale, each higher note is the first frequency multiplied by the 12th root of two, discounting little tuning tricks to make the intervals work better
The 12th root of two is 1.05946309436
Why do we use twelve? I don't know.
If you want an octave scale with 15 notes, then use the 15th root of 2 as the multiplier.
Tracklist - with the "notes per octave" listed.
1 Fanfare In 19-Note Equal Tuning, Op. 28a 2:25
Twelve Microtonal Etudes For Electronic Music Media, Op. 28 (43:34)
2 16 Notes - Andantino 3:46
3 18 Notes - Allegro Volando 2:30
4 21 Notes - Suite In Four Mvts. 4:48
5 23 Notes - Allegro Moderato 3:17
6 13 Notes - Sostenuto 3:10
7 15 Notes - Lento 3:35
8 17 Notes - Con Moto 2:51
9 22 Notes - Andante Ma Non Troppo 4:35
10 24 Notes - Moderato 3:02
11 14 Notes - Allegramente 2:42
12 20 Notes - Comodo 3:57
13 19 Notes - Allegro Moderato 4:06
Suite For Guitar In 15-Note Equal Tuning, Op. 33 (9:38)
14 I. Prélude (Allegro) 2:49
15 II. Sarabande (Andante) 2:46
16 III. Gavotte (Tempo Di Gavotta) 1:04
17 IV. Gigue (Vivo) 2:51