This is a progression in 18-EDO that modulates from "Cm" to "G" to "Dm." However, the 733 fifth is sharp enough to push "Dm" into sounding like "Ebm" - so the modulation happens by two 18-EDO 3/2 intervals, which equal an 18-EDO 7/6 interval. (Thus, in RTT terms, this overarching progression could be visualized as tempering out 28/27... I'm not sure what that temperament would be called. It's a very large comma, at 62.9609 cents)

Chord analogues in 12-EDO:
(C minor)
Cm    Eb/Bb    Bb    Fm/Ab     (x3)
(Modulation to G)
Cm    Eb/Bb    A7    D/A
(G Major)
G         Cm    Cm/D  D7           (x2)
(Modulation to Dm)
G        B7/A    Em7   A7
(D minor, a m3, NOT M2, higher than our original C minor)
Dm      F/C       C    Gm/Bb      (x6)

Modulation Cm G Dm (18 - EDO)

Reilly Spitzfaden (they/them) is a composer who likes noise, code, electronics, and nostalgia. They build handmade electronic instruments, design interactive software interfaces, and repurpose audio and telecommunications equipment as instruments.

Reilly's recordings appear on How Things Are Made, S3E02; in the Media Sandbox and Michigan State University Department of Theatre film (313) Choices; and on the recording Statements with the Michigan State University composition studio. Reilly’s compositions have been performed at the Darmstädter Ferienkurse and the TaPIR Lab, and by the Eastman BroadBand, members of ensemble mise-en, the Amaranth Quartet, OSSIA New Music, and How things are made.

Reilly is currently a lecturer in music technology at SUNY Geneseo. They hold a PhD in composition from the Eastman School of Music where they studied with Ricardo Zohn-Muldoon, David Liptak, and Oliver Schneller; an MA in composition from Eastman, where they studied with Robert Morris and Carlos Sanchez-Gutierrez; and a BM in composition from Michigan State University.

Modulation Cm G Dm (18 - EDO)

Stephen Weigel