Man page - jack_midi_clock(1)

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Package: jack-midi-clock
apt-get install jack-midi-clock

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jack-midi-clock

Manual

JACK_MIDI_CLOCK

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
REPORTING BUGS
COPYRIGHT

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/