NAME

       jack_mix_box - A minimal JACK audio mixer with MIDI volume control

SYNOPSIS

       jack_mix_box [-n <name>] [-p] [-s] [-v <dB>] MIDI_CC...

DESCRIPTION

       This manual page documents the jack_mix_box command.

       jack_mix_box  is  a  minimal, GUI-less version of jack_mixer. It creates a JACK client with stereo output
       ports and a fixed number of mono or stereo input ports. The number of input ports and  the  MIDI  Control
       Change message controlling the volume level of each is set via the command line. The signal of each input
       channel is mixed into the stereo outputs.

OPTIONS

       Positional arguments:
          MIDI_CC...      add input channel controlled by MIDI_CC

       Optional arguments:

          -h, --help
                 print this help message

          -n, --name
                 set JACK client name

          -p, --pickup
                 enable MIDI pickup mode (default: jump-to-value)

          -s, --stereo
                 make all input channels stereo with left+right input

          -v, --volume
                 initial volume gain in dBFS (default 0.0, i.e. unity gain)

USAGE

       Each positional argument is interpreted as a MIDI Control Change number and adds a mixer channel with one
       (mono) or left+right (stereo) inputs, whose volume can be controlled via the given MIDI Control Change.

       Use  jack_connect  or  any other JACK conmection manager to connect other JACK clients or system ports to
       the input and output port.

       Send a SIGUSR1 signal to the jack_mix_box process to have the current volumes per input channel  reported
       to the standard output.

   JACK AUDIO AND MIDI PORTS
       • For  each  input  channel,  jack_mix_box will create one (if it is a mono channel) or two (stereo) JACK
         audio input ports. The input port(s) will be named "Channel <n>", where "<n>" is  the  channel  number,
         and have an " L" resp. " R" suffix, it the channel is stereo.

       • It will create two JACK audio output ports named "MAIN L" and "MAIN R".

       • It will also create one JACK MIDI input ("midi in") and one MIDI output ("midi out") port.

ENVIRONMENT

       LANGUAGE, LC_ALL, LC_MESSAGES, and LANG
              The  first  of  these  environment  variables  set  to  a non-empty value is used to determine the
              language(s) for loading gettext translation files. The value should be a colon separated  list  of
              language codes.

       LC_NUMERIC
              The  language  set  via this environment determines the floating point number format used to parse
              volume levels given on the command line and to format them in the output.  If  LC_NUMERIC  is  not
              set, its value is inherited from one of the language environment variables described above.

       LOCALEDIR
              With  this  environment  variable,  the  base  directory  for the gettext translation files can be
              changed from the default set at compile time, which is usually <prefix>/share/locale.

SIGNALS

       SIGUSR1
              Send SIGUSR1 to the jack_mix_box process to have the current volumes reported per input channel.

SEE ALSO

       • Project homepage ( <https://rdio.space/jackmixer/> )

       • Source code repository on GitHub ( <https://github.com/jack-mixer/jack_mixer> )

       • JACK Audio Connection Kit ( <https://jackaudio.org/> )

AUTHOR

       Nedko  Arnaudov  <nedko@arnaudov.name>  (original  author),  Frédéric  Peters  <fpeters@0d.be>   (current
       maintainer).

COPYRIGHT

       GNU General Public License Version 2

19                                                 2021-04-14                                    JACK_MIX_BOX(1)