Dot-Guide for 18-EDD instruments



18-EDD Fretboard is based on the formula (Scale_Length/(2^(x/18))). On first instance, the problem with a 18-EDD guitar is the fret-space for tuning it, because the '4/3' interval is between 2 steps, which in first instance, is suggerent a dot-guide like a 1/3-tone version of 13-EDD :
18-EDO_Dot-Guide_0.png
18-EDD Dot Guide, form 1

The dots are in the places 4· 7· 11· 14· 18: 22· 25· 29· 32· 36: 40· denoting a scale of 3L2s 4;3 Relation, 4 3 4 3 4 with the tuning-dot on 7th fret.
Another possibility for a 18-EDD dot-guide is with the 6-EDD subset :
18-EDO_Dot-Guide_1.png
18-EDD equal-sized 6-EDD form

This dot-guide leaves in blank spaces the 7th and 8th frets, which are the 2 spaces between the '4/3' interval.
Step (form 1)
Purdal size
Cent size
|
Step (form 2)
Purdal size
Cent size
01
550
66.6
|
01
550
66.6
02
1100
133.3
|
02
1100
133.3
03
1650
200
|
03·
1650
200
04·
2200
266.6
|
04
2200
266.6
05
2750
333.3
|
05
2750
333.3
06
3300
400
|
06·
3300
400
07·
3850
466.6
|
07
3850
466.6
08
4400
533.3
|
08
4400
533.3
09
4950
600
|
09·
4950
600
10
5500
666.6
|
10
5500
666.6
11·
6050
733.3
|
11
6050
733.3
12
6600
800
|
12·
6600
800
13
7150
866.6
|
13
7150
866.6
14·
7700
933.3
|
14
7700
933.3
15
8250
1000
|
15·
8250
1000
16
8800
1066.6
|
16
8800
1066.6
17
9350
1133.3
|
17
9350
1133.3
18\0:
9900\0
1200\0
|
18\0:
9900\0
1200\0