Aha!  Yes, Dan Wilcox contributed a whole raft of changes to s_midi_alsa.c
August 2017.  So it looks like we're in the clear after all...

cheers
Miller

On Wed, Mar 14, 2018 at 10:06:10PM +0000, mario buoninfante wrote:
> Hi Simon,
> 
> yes the message is received and understood by other devices, so at the end
> of the day it's not a problem, mine is more curiosity :D
> 
> btw I've got a little update, after chatting with another Pd user, I figured
> it out that the problem doesn't occur on Pd 0.48.0 and 0.48.1 . but it does 
> occur on Pd 0.46.1, the version I was using when I discovered this.
> so my suspect is that something changed in the code. I'll have a look at
> github. does anyone know anything about that>
> 
> 
> cheers,
> Mario
> 
> On 14/03/18 21:49, Simon Iten wrote:
> > hi there,
> > 
> > i have sent sysex with puredata for some years now, and i never had any
> > problems, even with large chunks.
> > i have used attached abstraction to send sysex, maybe it helps?
> > 
> > midi IS a serial protocol, so it is perfectly valid to send one byte at
> > a time at least over din midi. in fact i am doing that with arduinos all
> > the time.  (usb midi is a different beast)
> > 
> > do the “special” midiout noteon and noteoff messages work when a
> > synthmodule or similar is connected?
> > 
> > 
> > 
> > 
> > > On 14 Mar 2018, at 21:28, mario buoninfante
> > > <mario.buoninfa...@gmail.com <mailto:mario.buoninfa...@gmail.com>>
> > > wrote:
> > > 
> > > Hi Miller,
> > > 
> > > yap I'm using ALSA.
> > > 
> > > btw, I had a look at the source code (I want to clarify I'm not a C
> > > programmer :) ) and from what I found in x_midi.c and s_midi.c, it
> > > kind of make sense that [midiout] returns 1 byte at time.
> > > 
> > > it seems to me we're missing a way to detect outgoing sysex messages
> > > (maybe having a dedicated object could help), so there's no way to
> > > collect a sysex and send it out in one go (ie having an array to
> > > return). I apologize for my trivial description of the "problem",
> > > but this is what I think is causing this behaviour.
> > > 
> > > 
> > > cheers,
> > > 
> > > Mario
> > > 
> > > 
> > > On 13/03/18 04:37, Miller Puckette wrote:
> > > > Hi Mario -
> > > > 
> > > > Perhaps you said this in the previous message which I missed... are you
> > > > using ALSA MIDI system or OSS?
> > > > 
> > > > MIDI support has always been a problem in Pd... largely because I don't 
> > > > have
> > > > a lot of experience with it.
> > > > 
> > > > cheers
> > > > Miller
> > > > 
> > > > On Tue, Mar 13, 2018 at 12:04:00AM +0000, mario buoninfante wrote:
> > > > > Hi,
> > > > > 
> > > > > 
> > > > > I ran few more tests on Linux trying to understand what's going on 
> > > > > with
> > > > > [midiout] and sysex messages.
> > > > > 
> > > > > I discovered that it's not just about sysex. I'm monitoring MIDI from 
> > > > > Pd
> > > > > with /KMidimon /and /GMIDImonitor/, and I noticed that also sending 
> > > > > Note On
> > > > > messages with [midiout] seems to be in some way different then 
> > > > > sending the
> > > > > same message using [noteout].
> > > > > 
> > > > > when Note On is sent using [midiout], this will spit single bytes 
> > > > > that are
> > > > > recognized as single byte sysex messages by the MIDI monitors!!!!!
> > > > > 
> > > > > has anyone ever experienced the same?
> > > > > 
> > > > > 
> > > > > cheers,
> > > > > 
> > > > > Mario
> > > > > 
> > > > > 
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