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10edo, or 10-tone equal temperament, is a tuning system which divides the octave into 10 equal parts of exactly 120 cents. It can be thought of as two circles of 5edo separated by 120 cents (or 5 circles of 2edo). It adds to 5edo a small neutral second (or large minor 2nd) and its inversion a large neutral seventh (or small major 7th); an excellent approximation of 13/8 and its inversion 16/13; and the happy 600-cent tritone that appears in every even-numbered EDO. Taking the the 360 cent large neutral third as a generator produces a heptatonic moment of symmetry scale of the form 1 2 1 2 1 2 1 (3L 4s - mosh). While not an integral or gap edo, it is a zeta peak edo. One way to interpret it in terms of a temperament of Just intonation is as a 2.7.13.15 subgroup, such that 105/104, 225/224, and 16807/16384 are tempered out. It can also be treated as a full 13-limit temperament, but it is a closer match to the aforementioned subgroup.

| Intervals | Images | Linear temperaments | Commas | Music | Instruments

Intervals

Degree
Cents
Approximate Ratios*
Additional Ratios*
of 3, 5 and 9
Interval Names
ups and downs notation
0
0
1/1
256/243, 50/49, 25/24
unison
unison, min 2nd
P1, m2
D, Eb
1
120
16/15, 15/14, 13/14
10/9, 13/12, 81/80
small neutral second, large minor second
mid 2nd
~2
D^, Ev
2
240
8/7, 15/13, 144/125
9/8, 7/6
second/third
maj 2nd, min 3rd
M2,m3
E, F
3
360
16/13
5/4
large neutral third
mid 3rd
~3
F^, Gv
4
480
64/49, 169/128
4/3, 9/7, 13/10
smaller fourth
maj 3rd, perf 4th
M3,P4
F#, G
5
600
91/64, 128/91, 169/120, 240/169
7/5, 10/7, 13/9, 18/13
tritone
up 4th, down 5th
^4,v5
G^, Av
6
720
49/32, 256/169
3/2, 14/9, 20/13
bigger fifth
perf 5th, min 6th
P5,m6
A, Bb
7
840
13/8
8/5
neutral sixth
mid 6th
~6
A^, Bv
8
960
7/4, 26/15, 125/72
16/9, 12/7
sixth/seventh
maj 6th, min 7th
M6,m7
B, C
9
1080
15/8, 28/15, 13/7
9/5, 24/13, 160/81
small major 7th
mid 7th
~7
C^, Dv
10
1200
2/1
243/128, 49/25, 48/25
octave
maj 7th, octave
M7, P8
C#, D
*based on treating 10-EDO as a 2.7.13.15 subgroup temperament.
*adding the ratios of 3, 5 and 9 introduces greater error while giving several more harmonic identities to the 10-EDO intervals.

For alternative notations, see Ups and Downs Notation -"Pentatonic" EDOs (pentatonic fifth-based) and Ups and Downs Notation - Natural Generators (heptatonic 3rd-based).

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Images


10edo wheel.png

Linear temperaments

Periods
per octave
Generator
Temperament(s)
1
1\10
Messed-up negri (or miracle)
1
3\10
Dicot/beatles/neutral thirds scale
2
1\10
Messed-up pajara
2
2\10
Decimal / messed-up lemba
5
1\10
Blackwood/blacksmith

Commas

10 EDO tempers out the following commas. (Note: This assumes the val < 10 16 23 28 35 37 |.)

Rational
Monzo
Size (Cents)
Name 1
Name 2
Name 3
256/243
| 8 -5 >
90.22
Limma
Pythagorean Minor 2nd

25/24
| -3 -1 2 >
70.67
5-limit large semitone
5-limit chromatic semitone

16875/16384
| -14 3 4 >
51.12
Negri Comma
Double Augmentation Diesis

9931568/9752117
| -25 7 6 >
31.57
Ampersand's Comma


2048/2025
| 11 -4 -2 >
19.55
Diaschisma


525/512
| -9 1 2 1 >
43.41
Avicennma
Avicennma's Enharmonic Diesis

49/48
| -4 -1 0 2 >
35.70
Slendro Diesis


50/49
| 1 0 2 -2 >
34.98
Tritonic Diesis
Jubilisma

686/675
| 1 -3 -2 3 >
27.99
Senga


64/63
| 6 -2 0 -1 >
27.26
Septimal Comma
Archytas' Comma
Leipziger Komma
9859966/9733137
| -10 7 8 -7 >
22.41
Blackjackisma


1029/1024
| -10 1 0 3 >
8.43
Gamelisma


225/224
| -5 2 2 -1 >
7.71
Septimal Kleisma
Marvel Comma

16875/16807
| 0 3 4 -5 >
6.99
Mirkwai


6772805/6751042
| 11 -10 -10 10 >
5.57
Linus


2401/2400
| -5 -1 -2 4 >
0.72
Breedsma


243/242
| -1 5 0 0 -2 >
7.14
Rastma


385/384
| -7 -1 1 1 1 >
4.50
Keenanisma


441/440
| -3 2 -1 2 -1 >
3.93
Werckisma


540/539
| 2 3 1 -2 -1 >
3.21
Swetisma


3025/3024
| -4 -3 2 -1 2 >
0.57
Lehmerisma


91/90
| -1 -2 -1 1 0 1 >
19.13
Superleap


676/675
| 2 -3 -2 0 0 2 >
2.56
Parizeksma


Music

Ten Fingers play by Bill Sethares (synth guitar)
Circle of Thirds play by Bill Sethares (synth ens.)
10_fantasy play by Aaron Krister Johnson (synth monody)
Prelude in 10ET by Aaron Andrew Hunt
Future play and Sol play by ZIA (synths and voice in 10)
Prelude by Rick McGowan (Rhino synthesizer)
Ideas on the Waterfall of Expression by Igliashon Jones (synth)
For two violas and gongs by Chris Vaisvil (website) more composition information
Blues 10 by Carlo Serafini (blog entry)
Waltz 10 by Carlo Serafini (blog entry)
Smooth 10 by Carlo Serafini (blog entry)

A sample of orchestral possibilities made using ZynAddSubFx under Linux (cenobyte)
3 tracks made in ZynAddSubFx simply mixed in Audacity (cenobyte)
10 Earwigs Invasive by Chris Vaisvil
Comets Over Flatland 9 by Randy Winchester
The Dramatic Squirrel Overture by Chris Vaisvil Details
Shimmerwing by Andrew Heathwaite and Chris Vaisvil
The Csx Freight at 1:20 am by Zach Curley
Sirmdbidnud2 by martinsj013 on SoundCloud
10tone demo by Clem Fortuna

Instruments


10-EDO lends itself exceptionally well to guitar (and other fretted strings), on account of the fact that five of its flat 4ths (at 480 cents) exactly spans two octaves (480*5=2400), meaning the open strings can be uniformly tuned in 4ths. This allows for greater uniformity in chord and scale fingering patterns than in 12-TET, making it exceptionally easy to learn. For instance, the fingering for an "E" chord would be 0-2-2-1-0-0 (low to high), an "A" chord would be 0-0-2-2-1-0, and a "D" chord would be 1-0-0-2-2-1. This is also the case in all EDOs which are multiples of 5, but in 10-EDO it is particularly simple.

Retuning a convention keyboard to 10edo may be done in many ways, but neglecting or making redundant the Eb and Ab keys preserves the sLsLsLs scale on the white keys. Redundancy may make modulation easier, but another option is tuning the superfluous keys to selections from 20edo which approximates the 11th harmonic with relative accuracy, among other features.

Decaphonic_Classic_Guitar.png
A Decaphonic (10-EDO) Classical Guitar
decaphonic-uke.JPG