Jack OS X a Jack audio connection kit implementation for Mac OS X

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Connecting audio (and now MIDI !)...
from any OS X application,
to any OS X application 
...and it's free! 
Version 0.9 now available!

What's Jack?

Jack (the Jack Audio Connection Kit) is a low-latency audio server, written originally for the GNU/Linux operating system, and now with Mac OS X support. It can connect any number of different applications to a single hardware audio device; it Starting in version 0.88, it also routes MIDI to/from any OS X application.

Jack is different from other audio server efforts in that it has been designed from the ground up to be suitable for professional audio work. This means that it focuses on two key areas: synchronous execution of all clients, and low latency operation.

What's Jack OS X?

Jack OS X is an OS X implementation of Jack, and it installs everything necessary to take full advantage of Jack on OS X. This includes:

The Jack server

The infrastructure you need in place to use Jack

The JackRouter

The JackRouter is a CoreAudio “user space” driver that allows any OS X CoreAudio application to become a Jack client.

The Jack audio plugins

Both AU and VST “Jack-aware” audio plugins are provided, which can further expand the limitless audio routing possibilities when using Jack.

The JackPilot application

JackPilot offers an easy to use GUI interface that allows you to control the Jack server, and manage the audio connections between applications and/or plugins.


May 23, 2014 - Posted updated links to version 0.9 beta 32.

Dec 2, 2013 - Posted updated links to version 0.9 beta 17. Version 0.9 beta addresses incompatibilities with OS versions 10.7.x-10.9.x that existed in previous versions of Jack OS X.

October 20, 2012 - We have experienced several issues beginning with OS 10.7.x and through 10.8.x, relating to changes in how Apple has implemented its underlying audio frameworks, as well as with its sandboxing of applications. We are continuing to try and work through these, but at the moment we do not have a solid idea of when we will be able to get around the problems. If anyone wants to help, please get in touch!

December 17, 2011 - Released updated version 0.89, which fixes a problem with audio output from Flash-based movies, improves support for Avid/Digidesign soundcards and also adds support for ProTools 9.

April 25, 2011 - Released updated version 0.88, which addes support for a Jack OS X / CoreMIDI bridge. The Jackdmp server has also been updated to the latest version.

October 20, 2010 - Released updated version 0.87, which fixes a problem with saving studio setups within JackPilot.

September 17, 2010 - Released updated version 0.86, which addresses several issues in the CoreAudio driver, especially when used with Apogee cards. A new feature, Monitor Ports (input ports that loopback everything that is sent to the audio output and make it available as an input) has been added. The Jackdmp server has also been updated to the latest version.

December 22, 2009 - Released updated version 0.85, which addresses a problem with the Jack OS X plugins being closed after the main Jack server has been shut down.  It also addresses a problem with some Digidesign cards, and updates the Jackdmp server to the latest version.

November 25, 2009 - Released upated version 0.84, which removes requirement to use Aggregate Device on Intel Macs. Also adds new "hog" mode, and fixes some server-related bugs.

October 12, 2009 - Released upated version 0.83, which adds Snow Leopard (OS X 10.6.x) support, and also now comes in two different packages, a legacy 32 bit version, and a "mixed" 64/32 bit version as well.

April 6, 2009 - Released upated version 0.82, which addresses a “deadlock” issue that appeared on some machines. It also increases the maximum number of Jack ports to 1024 (from 512).

February 10, 2009 - Released upated version 0.81, which fixes a “deadlock” issue in the Jackdmp server that could cause audio applications to hang. It also fixes a bug in JackRouter that was causing “dirty buffers” to continue playing when audio was stopped in Max/MSP.

January 16, 2009 - Released updated version 0.80, which updates JackRouter to allow it to be selected as the default system audio device again, addressing an issue introduced by OS X 10.5.6.  It also updates JackPilot to ensure that available sample rates for each device are now retrieved more reliably. Finally, it updates the Jackdmp server to the latest SVN version (1.91).

November 5, 2008 - Released updated version 0.79, which updates the Jackdmp server to the latest SVN version (1.90) to address a compatibility problem with Rogue Amoeba’s Audio Hijack application, and with input-only CoreAudio devices.  It also includes a fix to allow iTunes to work with Jack OS X when Jack is set up with more than 2 virtual channels.

July 30, 2008 - Released updated version 0.78, which updates Jackdmp server to address an issue causing the Ardour application to hang when quiting (in the case where Ardour started the Jack server itself).

April 11, 2008 - Released updated version 0.77, which updates Jackdmp server to address many issues, including a fix for a bug that was causing JackPilot to crash when accessing ports in some situations. Also includes fixes for JackRouter driver to address problems with AudioFile Engineering’s Rax, and Apple’s Quicktime Player and iMovie applications.

February 12, 2008 - Released updated version 0.76, addresses problem in how certain audio device state changes were managed. Also added menu items for quick access to Sound preference pane and Audio MIDI Setup utility.

January 24, 2008 - Released updated version 0.75 to support OS X 10.5.X (Leopard). Also first release including new Jackdmp server infrastructure.

January 7, 2007 - Fixed minimum requirements spec for Jack OS X versions 0.72 and 0.74 to be OS X 10.3.9, rather than previously incorrect listing of 10.3.x.

January 4, 2007 - Posted Arvid Tomayko-Peters' Autostart v1.1 application, which starts Jack OS X using predefined user settings. This version works with Jack OS X v 0.73 and 0.74.

May 4, 2006 - Released updated version 0.74, with fixed AU plugin that passes Apple AU validation.

April 13, 2006 - Released updated version 0.73, now Universal Binary, to allow running on either PowerPC or Intel architectures. Removed NetJack component until bugs fixed. Also removed legacy Port Audio driver. Updated to latest Jack server version.

January 27, 2006 - Released updated version 0.72, with bug fix updates to Jack server, Core Audio driver, Jack Audio Router, and JackPilot. Fixes a problem with VLC Media Player. No new features.

July 12, 2005 - Released updated version 0.71 to address problems with Rax and Plogue Bidule. No new features.

June 23, 2005 - Released updated version 0.7 to support OS X 10.4.x (Tiger), including Aggregate Audio Device functionality.

March 3, 2005 - Released updated version 0.61 to address problem with installer. No new features.

March 1, 2005 - New version 0.61 now available for download - fixes a bug causing application crashes and/or startup issues (Skype, Rax, etc.). Also now including Arvid Tomayko-Peter's startup Applescript in distribution.

February 21, 2005 - New version 0.6 now available for download - many bug fixes and compatibility improvements, including much better compatibility with Native Instruments applications, and now using the latest version of Jack server (0.99.49). The full change log is included in the documentation that comes with the package.

October 8, 2004 - New version 0.51 now available for download - bug fix release, no new functionality. The full change log is included in the documentation that comes with the package.

October 1, 2004 - New version 0.5 now available for download, including NetJack, the Jack network transmission module, an improved, lower overhead Core Audio driver, and expanded, step-by-step examples in the documentation. The full change log is included in the documentation that comes with the package.

September 30, 2004 - Site updated to reflect changed project name, from Jack Tools to Jack OS X. Also repointed download links to Sourceforge, to allow for higher volume of downloads.

March 24, 2004 - Jack-Autostart now available for download. Allows JackPilot and Jack to start up automatically when you log in.

January 28, 2004 - Jack Tools Uninstaller now available for download. In future releases, this will be bundled as part of the Jack Tools package.

January 23, 2004 - Sourceforge.net developer site opened to allow for easier collaboration between members of the development team.

January 7, 2004 - Jack Tools 0.4 now available for download. Away we go!

January 6, 2004 - Posted documentation for Jack Tools 0.4. First Jack Tools downloadable package expected in next 1-2 days.

January 2, 2004 - This site up with content for the first time.


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