NAME

       jack_midi_clock - JACK MIDI Beat Clock Generator

SYNOPSIS

       jack_midi_clock [ OPTIONS ] [JACK-port]*

DESCRIPTION

       jack_midi_clock - JACK app to generate MCLK from JACK transport.

OPTIONS

       -b <bpm>, --bpm <bpm>
              default BPM (if jack timecode master in not available)

       -B, --force-bpm
              ignore jack timecode master

       -d <sec>, --resync-delay <sec>
              seconds between 'song-position' and 'continue' message

       -J, --jitter-level <percent>
              add artificial jitter to the signal 0..20% default: off (0)

       -P, --no-position
              do not send song-position (0xf2) messages

       -T, --no-transport
              do not send start/stop/continue messages

       -s, --strict-bpm
              interpret tempo strictly as beats per minute (default is quarter-notes per minute)

       -h, --help
              display this help and exit

       -V, --version
              print version information and exit

       jack_midi_clock  sends  MIDI  beat  clock  message  if  jack-transport  is rolling.  it also sends start,
       continue and stop MIDI realtime messages whenever the transport changes state (unless -T option is used).

       In order for jack_midi_clock to send clock messages, a JACK timecode master must be present  and  provide
       the tempo map (bar, beat, tick).  Alternatively the -b option can be used to set a default BPM value.  If
       a value larger than zero is given, it will be used if no timecode master is present. Combined with the -B
       option it can used to override and ignore the JACK timecode master and only act on transport state alone.

       Either way, jack_midi_clock will never act as timecode master itself.

       Note  that song-position information is only sent if a timecode master is present ad the -P option is not
       given.

       To allow external synths to accurately sync to song-position, there is a two  second  delay  between  the
       'song-position  changed'  message  (which  is  not  a MIDI realtime message) and the 'continue transport'
       message.  This delay can be configured with the -d option and is only relevant for if playback starts  at
       a bar|beat|tick other than 1|1|0 in which case a 'start' message is sent immediately.

       jack_midi_clock runs until it receives a HUP or INT signal or jackd is terminated.

       See also: jack_transport(1), jack_mclk_dump(1)

REPORTING BUGS

       Report bugs to Robin Gareus <robin@gareus.org>
       Website: https://github.com/x42/jack_midi_clock/

COPYRIGHT

       Copyright © GPL 2013 Robin Gareus <robin@gareus.org>
       Copyright © GPL 2009 Gabriel M. Beddingfield <gabriel@teuton.org>