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OS 2.0 MIDI implementation and another question

OS 2.0 MIDI implementation and another question
« on: December 05, 2021, 12:57:36 PM »
Is there an updated MIDI spec for OS 2.0? I couldnít see anything for chord mode or poly unison in the chart.

Also, what is NRPN 55-64 (Unison Note) for? Itís not the voice count.