Symphony in Microtones concludes with this movement cast in a form abstracted from the traditional passacaglia.  Instead of repeating a single bass line  with variations above it, the movement develops a sequence of closely related bass lines, but united by a common harmonic feature.  They all effect a modulation through the same superparticular ratio, namely 123201/123200.  Of course this interval effectively sounds as a unison, but its use produces the effect modulations that return to the home key (or chord) yet without any "rewinding."   

The actual "writing" above the bass line involves simple harmonic and subharmonic series to make the complex intervals recognizable in principle by any listener willing to do the counting (consciously or not).

Symphony in Microtones (4th movement)

Composer, mathematician, visual artist. 
Seeks collaboration with performers and choreographers.

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Symphony in Microtones (4th movement)

David Victor Feldman