Dot-Guide for 21-EDD instruments



21-EDD Fretboard is based on the formula (Scale_Length/(2^(x/21))). Well, a dot-guide for 21-EDD in first instance would be like 13 & 18 EDDs, as see below:21-EDD Fretboard 0.png The dots are in the places 5· 8· 13· 16· 21: 26· 29· 34· 37· 42: 47· denoting a scale of 3L2s 5;3 Relation, 5 3 5 3 5.
Step
Purdal size
Cent size
01
471,4
57.14
02
942,9
114.29
03
1414,3
171.43
04
1885,7
228.57
05·
2357,1
285.71
06
2828,6
342.86
07
3300
400
08·
3771,4
457.14
09
4242,9
514.29
10
4714,3
571.43
11
5185,7
628.57
12
5657,1
685.71
13·
6128,6
742.86
14
6600
800
15
7071,4
857.14
16·
7542,9
914.29
17
8014,3
971.43
18
8485,7
1028.57
19
8957,1
1085.71
20
9428,6
1142.86
21\0:
9900\0
1200\0
Another type of dot-guide is with Mark Allan Barnes 14-EDD homologous :
21-EDD Fretboard 1.png
21-EDD "Triple Septum" Dot-Guide
The dots are in the places 3· 6· 9· 12· 15· 18· 21: 24· 27· 30· 33· 36· 39· 42: 45· denoting the 7-EDD subset in it.
For last, a dot-guide more creative, but consistent too:
21-EDD Fretboard 2.png
21-EDD "Superbiun" Dot-Guide
The dots are in the places 3· 4· 7· 10· 11· 14· 17· 18· 21: 24· 25· 28· 31· 32· 35· 38· 39· 42: 45· & 46· denoting a scale of 6L3s 3;1 Relation, 3 1 3 3 1 3 3 1 3.
Step (form 2)
Purdal size
Cent size
|
Step (form 3)
Purdal size
Cent size
01
471,4
57.14
|
01
471,4
57.14
02
942,9
114.29
|
02
942,9
114.29
03·
1414,3
171.43
|
03·
1414,3
171.43
04
1885,7
228.57
|
04·
1885,7
228.57
05
2357,1
285.71
|
05
2357,1
285.71
06·
2828,6
342.86
|
06
2828,6
342.86
07
3300
400
|
07·
3300
400
08
3771,4
457.14
|
08
3771,4
457.14
09·
4242,9
514.29
|
09
4242,9
514.29
10
4714,3
571.43
|
10·
4714,3
571.43
11
5185,7
628.57
|
11·
5185,7
628.57
12·
5657,1
685.71
|
12
5657,1
685.71
13
6128,6
742.86
|
13
6128,6
742.86
14
6600
800
|
14·
6600
800
15·
7071,4
857.14
|
15
7071,4
857.14
16
7542,9
914.29
|
16
7542,9
914.29
17
8014,3
971.43
|
17·
8014,3
971.43
18·
8485,7
1028.57
|
18·
8485,7
1028.57
19
8957,1
1085.71
|
19
8957,1
1085,71
20
9428,6
1142.86
|
20
9428,6
1142.86
21\0:
9900\0
1200\0
|
21\0:
9900\0
1200\0