Note on with velocity 0 should be treated the same as note off
Virtual MIDI controller for Linux, Windows and OSX
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According to the MIDI 1.0 Detailed Specification document, a note on with velocity 0 message should be treated the same as note off.
For example, using OSS MIDI input in VMPK with a Casio WK-1300 keyboard fails to release the notes properly.
Reference:
http://oktopus.hu/uploaded/Tudastar/MIDI%201.0%20Detailed%20Specification.pdf
Fixed in change r434