18-EDD

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-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-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