[PD] Sysex out problems (linux only)

Alex x37v.alex at gmail.com
Wed Jul 8 19:24:39 CEST 2009

I think that pd's midi out doesn't take whole sysex messages though,
you simply send a stream of bytes.  This is how it has been working
for me.  I created an abstraction which takes a list of bytes and
makes it into a sysex message (stream of bytes) [adds the sysex start
and start and then outputs bytes one by one] and it works quite well
for me.

I've attached it just as an example.

Btw, the sysex loopback code [using the software through] that you
sent initially does work for me.. I get the whole message.


2009/7/8 Martin Peach <martin.peach at sympatico.ca>:
> András Murányi wrote:
>> 2009/7/8 Martin Peach <martin.peach at sympatico.ca
>> <mailto:martin.peach at sympatico.ca>>
>>    András Murányi wrote:
>>        Dear Sirs,
>>        I just have never been successful with sysex in Pd and I'm
>>        asking for your kind advice.
>>        Attached is an example for a long sysex message which goes out
>>        on [midiout] (linux only, afaik).
>>        The problems I have:
>>        - sysex gets fragmented (also when nothing is sent out meanwhile
>>        by other objects). It is always properly terminated with '247'
>>        but the content is often truncated. Is this a bug/feature...?
>>        What is your best recommendation knowing that my patch is full
>>        of sysex outs (+envelopes on some of them!)
>>    in the patch you posted, the message you send to [midiout] is
>>    [240,67,16,73,8,$2,19,$1,247(
>>    , which Pd takes as 9 separate messages because of the comma in
>>    between each item.
>>    Probably [240 67 16 73 8 $2 19 $1 247( would work better.
>> Dear Martin,
>> that is how it goes afaik, sysex is kind of a sequence, which is comma
>> separated
> Yes and no: sysex is a sequence that starts with the value 240 (hex F0)
> followed by a number of bytes, each less than 128, and ends with 247 (hex
> F7). There are no commas in it unless the message contains commas. (If you
> really want to send commas you would need to specify the ASCII code for a
> comma, 44.)
> As far as Pd goes, separating items in a message box makes them into
> separate messages, so it's no surprise they get sent out separately.
> Martin
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