Harpejji - Revision history

Fredg999 category edits: Categories

2023-01-12T05:11:02Z

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← Older revision		Revision as of 05:11, 12 January 2023
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	The Harpejji (see [https://en.wikipedia.org/wiki/Harpejji Wikipedia]) is a tapping stringed instrument which is a physically constrained to be an [[isomorphic keyboard]]. It is a successor to the StarrBoard which was created by [[John Starrett]].		The '''Harpejji''' (see [https://en.wikipedia.org/wiki/Harpejji Wikipedia]) is a tapping stringed instrument which is a physically constrained to be an [[isomorphic keyboard]]. It is a successor to the StarrBoard which was created by [[John Starrett]].

	The standard layout for a Harpejji is like this, with the open strings tuned in whole tones of 12edo, so that the seventh string is an octave above the first.		The standard layout for a Harpejji is like this, with the open strings tuned in whole tones of 12edo, so that the seventh string is an octave above the first.
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	In this case the frets of a single string turn out to be exactly 8edo.		In this case the frets of a single string turn out to be exactly 8edo.

			[[Category:Instruments]]

Keenan Pepper: neutral thirds stuff

2019-09-07T23:55:20Z

neutral thirds stuff

@@ Line 38: / Line 38: @@
 As you can see, the up-and-to-the-right (meantone) diatonic scale has exactly the same shape on the fretboard, and the main difference compared to the 12edo layout is that unisons are no longer a knights-move away on adjacent strings (2 up and 1 left). Instead, in 19edo the unisons are 3 up and 2 left. This means the down-and-to-the-right shape doesn't work the same way anymore, since from E you have to skip over E# to get to F.
-An alternative layout for 19edo, based on preserving the shape of the down-and-to-the-right shape of the diatonic scale, looks like this:
+An alternative layout for 19edo, based on preserving the down-and-to-the-right shape of the diatonic scale, looks like this:
   Eb F  G  A  B  c# d# f# gb ab bb c'
@@ Line 49: / Line 49: @@
 While the previous 19edo layout had successive frets spaced at a distance of 2 19edo steps from each other, this layout instead has every 19edo step as its own fret. This could be a disadvantage in that the spaces between frets might become too small for the fingers in the high register.

Keenan Pepper: two diatonic scale shapes

2019-09-07T22:47:31Z

two diatonic scale shapes

@@ Line 9: / Line 9: @@
   C  D  E  F# G# Bb c  d  e  f# g# bb
-However, the same general idea for a layout can also be applied to any chain-of-fifths EDO, and the only difference is what shape the unisons take on the fretboard. (For a rank-2 chain-of-fifths tuning which is not an EDO, there will be no unisons on different strings).
+Note that the diatonic scale appears in two different shapes in this layout: an up-and-to-the-right shape:
-For example, a 19edo Harpejji layout might look like this:
+                               c' d'
   F  G  A  B  c# d# e# gb ab bb c' d'
@@ Line 21: / Line 36: @@
 To interpret this, keep in mind that C-D is 3 steps of 19edo, E-F is 2 steps, and # and b modify pitches by 1 step. Thus there is a consistent spacing of 3 steps between adjacent strings (columns), and adjacent frets (rows) are 2 steps apart. (In contrast to 12edo, G#-Ab is not a unison but E#-Fb is.)
-As you can see, the (meantone) diatonic scale has exactly the same shape on the fretboard, and the main difference compared to the 12edo layout is that unisons are no longer a knights-move away on adjacent strings (2 up and 1 left). Instead, in 19edo the unisons are 3 up and 2 left.
+As you can see, the up-and-to-the-right (meantone) diatonic scale has exactly the same shape on the fretboard, and the main difference compared to the 12edo layout is that unisons are no longer a knights-move away on adjacent strings (2 up and 1 left). Instead, in 19edo the unisons are 3 up and 2 left. This means the down-and-to-the-right shape doesn't work the same way anymore, since from E you have to skip over E# to get to F.

Keenan Pepper: start article

2019-09-07T21:46:40Z

start article

New page

The Harpejji (see [https://en.wikipedia.org/wiki/Harpejji Wikipedia]) is a tapping stringed instrument which is a physically constrained to be an [[isomorphic keyboard]]. It is a successor to the StarrBoard which was created by [[John Starrett]].

The standard layout for a Harpejji is like this, with the open strings tuned in whole tones of 12edo, so that the seventh string is an octave above the first.

E F# G# Bb c d e f# g# bb c' d'
Eb F G A B c# eb f g a b c#'
D E F# G# Bb c d e f# g# bb c'
C# Eb F G A B c# eb f g a b
C D E F# G# Bb c d e f# g# bb

However, the same general idea for a layout can also be applied to any chain-of-fifths EDO, and the only difference is what shape the unisons take on the fretboard. (For a rank-2 chain-of-fifths tuning which is not an EDO, there will be no unisons on different strings).

For example, a 19edo Harpejji layout might look like this:

F G A B c# d# e# gb ab bb c' d'
E F# G# A# cb db eb f g a b c#'
D# E# Gb Ab Bb c d e f# g# a# cb'
Db Eb F G A B c# d# e# gb ab bb
C D E F# G# A# cb db eb f g a

To interpret this, keep in mind that C-D is 3 steps of 19edo, E-F is 2 steps, and # and b modify pitches by 1 step. Thus there is a consistent spacing of 3 steps between adjacent strings (columns), and adjacent frets (rows) are 2 steps apart. (In contrast to 12edo, G#-Ab is not a unison but E#-Fb is.)

As you can see, the (meantone) diatonic scale has exactly the same shape on the fretboard, and the main difference compared to the 12edo layout is that unisons are no longer a knights-move away on adjacent strings (2 up and 1 left). Instead, in 19edo the unisons are 3 up and 2 left.