Provided by: jack-midi-clock_0.4.3-1_amd64 bug


       jack_midi_clock - JACK MIDI Beat Clock Generator


       jack_midi_clock [ OPTIONS ] [JACK-port]*


       jack_midi_clock - JACK app to generate MCLK from JACK transport.


       -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)


       Report bugs to Robin Gareus <>


       Copyright © GPL 2013 Robin Gareus <>
       Copyright © GPL 2009 Gabriel M. Beddingfield <>