[PD] sysex messages
mario.buoninfante at gmail.com
Thu Feb 22 23:05:57 CET 2018
yap, I know that at the end of the day MIDI is dealing with 1 byte at
time. I was wondering why there's a difference between 2 different piece
of code that generates MIDI (Pd and Hardware synth).
for example I just monitored (via USB) my Novation Circuit (a groovebox)
and Gmidimonitor receives messages 81 bytes long. with Pd as I said is
always 1 byte.
now my question would be, how is this possible?
I'm sure Circuit sends sysex 81 bytes long, so I know that this is
correct, but still I don't know why Pd doesn't allow something like that.
On 02/22/2018 09:58 PM, Alex wrote:
> MIDI is a serial protocol, individual bits running down a single line,
> we now also have USB midi which is a little bit different than that
> but usually that is abstracted for you.
> The software monitor you're using likely groups these for you but in
> reality you simply have a stream of individual bits on the hardware
> PD's object let you do bytes at a time instead of individual bits :)
> On Thu, Feb 22, 2018 at 1:47 PM, mario buoninfante
> <mario.buoninfante at gmail.com <mailto:mario.buoninfante at gmail.com>> wrote:
> Hi Alex,
> thanks for your reply. I think that also using your abstraction Pd
> will spit out 1 byte per time (I didn't check it, but I assume
> that cause it's not an external in C).
> about MIDI if I'm not wrong, bytes are grouped in accord with the
> type of message, ie Note on/off and CC are 3 bytes messages,
> channel pressure and program change are 2 bytes, sysex have
> variable length and so on. and I presume they're sent out in group.
> in fact when I monitor MIDI messages coming for certain
> applications (I'm on Linux and I'm using Gmidimonitor) the console
> tells me the sysex size in bytes. so, with Pd the size is always 1
> byte, but with other programming languages and softwares is
> variable and goes in accord with the sysex I generated.
> On 02/22/2018 09:34 PM, Alex wrote:
>> I haven't tested in a while but I wrote an abstraction to take a
>> list, wrap it in the sysex start and end and output it as
>> individual bytes: https://github.com/x37v/pure_data
>> midi is a byte oriented protocol..
>> On Thu, Feb 22, 2018 at 1:24 PM, mario buoninfante
>> <mario.buoninfante at gmail.com
>> <mailto:mario.buoninfante at gmail.com>> wrote:
>> do you guys know if there's a way to send a list of sysex
>> messages (or 1 complete message, let's say 8 bytes long)
>> rather then 1 byte per time?
>> if not, do you know if there's a particular reason why it's
>> not possible?
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