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Jack MIDI Clock

This program is a JACK client that sends MIDI beat clock pulses based on the current tempo given by the JACK transport.


  • Standard C development tools (cc, make, libc)
  • Jack Audio Connection Kit (libjack-dev)


 git clone git://
 cd jack_midi_clock
 sudo make install

The makefile honors CFLAGS, LDFLAGS, DESTDIR and PREFIX variables. e.g. make install PREFIX=/usr and also supports uninstall target as well as individual [un]install-bin, [un]install-man targets.


Start jackd and some application to act as JACK-timecode master, then launch:

 jack_midi_clock &

The application runs until it receives a TERM or QUIT signal or jackd terminates.

Also see jack_midi_clock -h or the included manual page.


jack_midi_clock is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 or (at your option) any later version.

Copyright (C) 2009 by Gabriel M. Beddingfield Copyright (C) 2013 by Robin Gareus

See COPYING for the complete license text.

About JACK MIDI Clock

Jack Midi Clock is free software written to glorify God and His Savior Jesus Christ. I dedicate this code to spreading His word and His love. If you have found this software useful, please make a donation to a Christian missionary (of your choice).[1] Suggested donation is US $10 or US $20.

Questions? Drop me a line:

Grace and peace to you all!

[1] Suggestion on missionaries: Wycliffe Bible Translators (

PS. Updates and fixes to the source as well as build-system - contributed by R. Gareus in 2013 - were motivated by the live performance at the Linux Audio Conference 2013. Robin neither approves nor advises against monetary donations, but he subscribes to the virtue of altruistic love and wishes you to do likewise.


JACK MIDI Clock - Utility to send MIDI Beat Clock pulses that follow the JACK Transport




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