Checks whether the status type of the message is 'Note Off' or 'Note On' with a velocity of 0.
IMPORTANT: As per MIDI 1.0, a 'Note On' event with a velocity
of zero should be treated like a 'Note Off' event.
Which is why this function checks velocity == 0.
Some devices send a 'Note On' message with a velocity
value of zero instead of a real 'Note Off' message.
Many DAWs will automatically convert such ones to
explicit ones, but one cannot rely on this.
Checks whether the status type of the message is 'Note Off' or 'Note On' with a velocity of 0.
IMPORTANT: As per MIDI 1.0, a 'Note On' event with a velocity of zero should be treated like a 'Note Off' event. Which is why this function checks velocity == 0.
Some devices send a 'Note On' message with a velocity value of zero instead of a real 'Note Off' message. Many DAWs will automatically convert such ones to explicit ones, but one cannot rely on this.