a2j wiring

[tstex]

Currently alsa/a2j device numbers can change each session, which breaks Carla midi patch wiring. (Ubuntu Studio 22.04)

Is there a way to stop a2j devices changing every session? Some Ubuntu utility? Pipewire?

If there was a mapping that used device names instead of device numbers, that might help...

[tstex]

Nevermind. a2jmidid -u flag did it. (Exposed in Studio Controls UI)

a2jmidid(1) User Manuals a2jmidid(1)

NAME
a2jmidid - JACK MIDI daemon for ALSA MIDI

SYNOPSIS
a2jmidid [-j jack-server] [e | --export-hw]

DESCRIPTION
a2jmidid is a daemon that implements automatic bridging. For every ALSA sequencer port you get one jack midi port. If
ALSA sequencer port is both input and output one, you get two JACK MIDI ports, one input and output.

OPTIONS
-e | --export-hw
forces a2jmidid to bridge hardware ports as well as software ports

   -u     forces a2jmidid to generate non-unique port names (see NOTES)

   -j     specifies which jack-server to use

NOTES
ALSA does not guarantee client names to by unique. I.e. it is possible to have two apps that create two clients with
same ALSA client name. JACK however requires port names to be unique. To ensure this uniqueness, a2jmidid will add
the unique numeric ALSA client ID to the JACK port name. However this behaviour is known to be problematic when
restoring connections using simplistic tools like aj-snapshot and jack_connect. In order to make them work, the -u
option can be used. This option will cause a2jmidid to omit the numeric ALSA Client ID from JACK port names. In this
mode, ALSA client name uniqueness must be guaranteed externally.

AUTHOR
Eric Hedekar

SEE ALSO
a2j_control(1), a2jmidi_bridge(1), j2amidi_bridge(1)

Linux July 2009 a2jmidid(1)
Manual page a2jmidid(1) line 1/35 (END) (press h for help or q to quit)