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Re:Show HN: An attempt to rethink a music sequencer design by RickS on Thursday April 27, 2017 @01:06PM (#14213057)
max/msp might be of interest, then: https://cycling74.com/products/max/
Re:Show HN: An attempt to rethink a music sequencer design by blacksmith_tb on Thursday April 27, 2017 @01:35PM (#14213291)
And/or PD (pure data)[1] which is its FOSS cousin.

1: http://puredata.info/

Re:Show HN: An attempt to rethink a music sequencer design by tomduncalf on Thursday April 27, 2017 @02:31PM (#14213709)
Max for Live is probably particularly relevant here, as you get the full compositional power of Live, plus the flexibility of Max/MSP