Re: Problems reconnecting MIDI device on RPi

IOhannes m zmoelnig <[email protected]> Mon, 4 Nov 2024 18:28:52 +0100

Newsgroups	gmane.comp.multimedia.puredata.general
Message-ID	<[email protected]>

On 11/4/24 15:48, Alberto Novello wrote:
> Which is what worries me cause there is no Pure Data even if it's
> running....

right, that would explain why 'aconnect' cannot connect :-)

the default MIDI backend in Pd is "OSS MIDI".
in order to ALSA seq as a MIDI backend, you have to explicitly choose it.
the simplest way is obviously via the "Media" menu (pick the aptly named
"ALSA-MIDI", and make sure to set the "In Ports" and/or "Out Ports" to
some non-0 value (e.g. "1").
to make the settings persistent, you have to "Save All Settings".

alternatively (if you start Pd from the cmdline), you could simply add
the "-alsamidi -mididev 1" flags.

note: for some obscure reason which i do not remember, the default
number of in/out ports for ALSA-MIDI is 0 (zero, nada). Adding the flag
"-mididev 1" will make sure you get one port in each direction. contrary
to common sense, the actual number you put there does not matter (so you
could also use "-mididev 0" to get one port. If you want multiple ports,
specify them with multiple comma-separated numbers. e.g. "-mididev 1,2"
will give you to ports. that's because with "-mididev" you are actually
'selecting' (pseudo-)MIDI devices rather than specifying their number.
this is for consistency with other backends.

mfgasdr
IOhannes

PS: personally i think that this behaviour is non-intuitive (even though
iirc it was me who implemented it like this) and should probably be
fixed as in:
- '-alsamidi' (without any "-mididev" argument) should default to a
single port.
- '-alsamidi -mididev 2' should probably create a single port as well,
but with a port-number "2" (for both in and out port).
similarily, "-alsamidi -mididev 1,4" should create two ports with
port-numbers "1" resp "4".
probably time for a feature request :-)

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