I've created a command line fork of the Polymeter MIDI Sequencer, with all user interface code removed. This Visual Studio 2012 project builds a Windows command line application which opens and plays a Polymeter (.plm) document. The application can also export the document to a standard MIDI file. Removing the user interface greatly reduces the number of lines of code, which could facilitate porting the sequencer to other platforms. Be advised that this project still depends on MFC, and on the Windows API, and particularly on the MIDI streams API. The MFC dependencies include CArray, CMap, CString, CFile, and CStdioFile, and while these could in theory be replaced with standard library classes, this is a task best suited to a standard library expert, which I'm surely not. The repository is HERE.
Polymeter is a free, open source 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. I originally developed this software in the 1990s in order to compose polymeter electronic dance music, but it became obsolete, so I'm rescuing from bit rot what might be (for all I know) the world's only sequencer optimized for polymeter.
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