Polymeter is a MIDI sequencer for music that's in multiple prime meters (1, 2, 3, 5, 7, 11, etc.) simultaneously. Each track has its own loop length, and when the lengths differ, the tracks "slip" (or shift phase) relative to each other. The resulting interference pattern is sufficiently intricate that variations similar to the embellishments of a live performer can be generated algorithmically.
The current software is based on software I developed in the 1990s in order to compose polymeter-based electronic dance music. I'm rescuing from bit rot what might be (for all I know) the world's only sequencer optimized for polymeter. It's a long battle, but it's worth it to be able to compose complex polymeter again.
April 23, 2019
February 26, 2019
Version 0.0.24 adds an option to prevent overlapping instances of the same note on a channel.
January 29, 2019
Version 0.0.23 adds graphing (via Graphviz) and a MIDI input bar.
January 17, 2019
Version 0.0.22 adds recursive position modulation and also fixes some serious bugs.
January 10, 2019
Version 0.0.21 adds a MIDI output bar and a piano bar.
December 19, 2018
Version 0.0.20 adds import/export of tracks from/to CSV format.
December 15, 2018
Version 0.0.19 adds note ranges, range modulation, position modulation, and more.
December 7, 2018
Version 0.0.18 adds recording of MIDI input to tracks.
November 20, 2018
Version 0.0.17 adds recursive modulation.
November 5, 2018
Version 0.0.16 adds MIDI import and fill commands and fixes many issues.
October 8, 2018
Version 0.0.15 allows unlimited modulation, song MIDI export, track stretch and more.
August 18, 2018
Version 0.0.13 fixes some issues with the Live view, just in time for the Berlin shows.
July 22, 2018
Version 0.0.12 adds overdubbing and a few minor features, and fixes some bugs.
July 11, 2018
Version 0.0.11 adds functionality to the Live view, including per-part progress bars.
July 8, 2018
Version 0.0.10 adds various small features and fixes some bugs.
July 5, 2018
Version 0.0.9 adds live performance view, grouping tracks into parts, and full screen mode.
June 18, 2018
Version 0.0.8 adds track solo, presets, and song view editing commands.
June 6, 2018
Version 0.0.7 adds song view, for editing the arrangement on a timeline.
May 26, 2018
Version 0.0.6 adds recording of a live arrangement.
May 19, 2018
Version 0.0.5 adds velocity editing, controller tracks, and much more.
May 10, 2018
Version 0.0.4 adds step editing commands.
May 4, 2018
Version 0.0.3 supports tied notes, via Shift+left-click in steps view.
Apr 29, 2018
Version 0.0.1 allows unlimited track length, thanks to a completely redesigned UI.
Apr 22, 2018
The initial alpha (0.0.0) is released.