Microtonal Ambient Music - De-Tempered Glacial[7] + Fluid Just-Intonation

Remastered version available on Bandcamp: https://therasa.bandcamp.com/

De-Tempered Glacial[7] with Fluid Just-Intonation

This scale is kind of like the lydian dominant scale but more neutral and whole-toney, kind of like 7EDO. With some subtle pitch-shifting it can morph smoothly into the JI major scale and back again. I based the scale on Glacial[7] which is a subset of 13EDO with the tone/semitone pattern of T,T,T,T,T,T,S. I like the idea of this pattern but I wanted to have some perfect fifths, so I de-tempered it by making each tone about 10 cents smaller. I arrived at this by defining each tone as one quarter of a perfect fifth, or about 175 cents. The 'semitone' fills the gap at the end and turns out to be about 147 cents.

I mapped the scale in C to the white keys of a standard keyboard and used the black notes for a copy of the scale transposed up three tones to Gb. This provides more possibility for harmonic modulation, and also the Ab forms a useful neutral sixth exactly a perfect fifth away from the neutral third in the key of C.

Since the third (351c), seventh (1053c), and this neutral sixth (849c) are all related by perfect fifths, I sometimes had them gradually drift up together by 35 cents to settle into just intonation, and then drift back to their more neutral and somewhat alien-sounding starting position. I also had the overall pitch drift around throughout to add to the fluidity. If you skip through to random spots you'll notice clear differences in tonality that are barely perceptible when listening normally.

For reference:
Scale in C:
C - 0c
D - 175c
E - 351c
F - 526c
G - 702c
A - 877c
B - 1053c
C - 1200c

Transposed to Gb:
Gb - 674c
Ab - 849c
Bb - 1025c
C - 1200c/0c
Db - 175c
Eb - 351c
F - 526c
Gb - 674c