just can't output note on velocity 0 through [midiout] .

"note on velocity 0"
is allways transformed to
"note off velocity 0"message by design

I need to output “note on velocity 0”
to the software

the software refuse to recognize
any note off messages

are you using [noteout]? that seems like it should work

What is the software you're sending to and how are you inspecting the received bytes on that end?

@midi said:

I need to output “note on velocity 0”
to the software

the software refuse to recognize
any note off messages

I just tested as follows (sending a nonzero midinote number of course):

... and found that (at least in Linux, using the ALSA MIDI protocol) [midiout] transmits the bytes exactly as given, without transforming note-on to note-off.

I don't know about Mac or Windows MIDI behavior.

But... when I set up a MIDI responder in SuperCollider (because SC distinguishes between noteOn and noteOff, unlike Pd where velocity is the only thing that distinguishes them), I found that SC changes in note-on message with velocity = 0 to a note-off message.

When I set, in SC, MIDIIn.noteOnZeroAsNoteOff = false;, then the zero-velocity message was received as note-on.

Now, that's not a guarantee that it will do this on all platforms. But, I don't find anything in Pd's sources that changes the status byte in this case. So if that's definitely always happening in your environment, then it must be either PortMIDI in Pd, or the receiving software is doing it.

hjh

@ddw_music
many thanks!

It reminds me that my PD patch having no prolem in windows and older MacOs

But when I switch to
new apple sillcon,

the same software (apple version)just desen't work with my PD patch properbly!

it must be
the internal midi bus
"IAC bus" in new MacOS

does the bad thing you describe

@ddw_music
new apple "IAC bus" is confirmed guilty！
see the evidenceces

dont put length probably. note-on doesnt use length. makenote uses length.

@willblackhurst said:

dont put length probably. note-on doesnt use length. makenote uses length.

Nobody has mentioned length in this thread... cause of the problem was already found anyway.

hjh