Tuning for Double Chromatic: Fully chromatic slide diatonic spiral with all the chords!
Posted: Thu Dec 12, 2019 2:36 pm
A spiral tuned harp has all the standard triad chords in its key, three major chords and three minor chords. Thus, it covers the major chords of one quadrant of the circle of fifths plus their minor parallels, one fourth of all the common chords.
The following tuning for Brendan Power's twin chromatics consists of four spiral tuned plates in keys Eb, C, A and F#, together covering all 24 minor and major triads.
Except for covering all the chords, with this choice of keys any key could be played within one of the spirals and at most one note from another spiral.
The spirals are shifted so that pushing a slider not only changes the key signature, but also takes you to the next note of the scale like a slide diatonic.
The key of C has diatonic slide decorations at every note, and most other keys have them at all but one or two notes.
So to describe it with a few basic selling points:
* Chromatic!
* All the chords!
* Any key with at most one slider note!
* Acts as a slide diatonic in most keys!
The following tuning for Brendan Power's twin chromatics consists of four spiral tuned plates in keys Eb, C, A and F#, together covering all 24 minor and major triads.
Code: Select all
Slider a+b E# G# B D# F# A# C# E# G# B D# F#
Slider a D F# A C# E G# B D F# A C# E
Blow: No Slider C E G B D F A C E G B D
Slider b D F Ab C Eb G Bb D F Ab C Eb
Hole: 1 2 3 4 5 6 7 8 9 10 11 12
Slider a+b F# A# C# E# G# B D# F# A# C# E# F#
Slider a E G# B D F# A C# E G# B D F#
Draw: No Slider D F A C E G B D F A C E
Slider b Eb G Bb D F Ab C Eb G Bb D F
The spirals are shifted so that pushing a slider not only changes the key signature, but also takes you to the next note of the scale like a slide diatonic.
The key of C has diatonic slide decorations at every note, and most other keys have them at all but one or two notes.
So to describe it with a few basic selling points:
* Chromatic!
* All the chords!
* Any key with at most one slider note!
* Acts as a slide diatonic in most keys!