My understanding of the MIDI spec is that there are two ways that a Note-Off event is produced.

1: Note-Off can be produced by 0x80 (top bit set in high nibble of the Status Byte),
2: Also if the velocity is set to zero then the Note-On message is interpreted as a Note-Off message, therefore releasing the note (Note-off).

BiaB probably use the second implementation

HTH. And good luck with your project!

Trevor


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