Audio server, useful for sound processing. Jack is the backend and is often packaged with qjackctl GUI application, which in turn requires Qt Qt4. If you require the GUI frontend see qjackctl qjackctl page.

Install the appropriate software package, or compile source:

0.x series

jack-0.121.2-w-20110705.pet 300KB {contains DEV & DOC files} packaged by coolpup

jack-0.120.2-w-20110612.pet 273KB {contains DEV files} packaged by coolpup

1.x series

jack-1.9.9.5-i486.pet packaged by Koulaxizis

Source code distribution: http://jackaudio.org/download

Dependencies: +alsalib alsa-lib,+bzip2,+celt,+grep,+libffado,+libsamplerate,+libsndfile,+tar

Version and usage information via the command-line interface:

UsingJack Using Jack

qjackctl - information about the frontend GUI

Time Machine - background audio recorder

Jack homepage

Jack FAQ

jackd manual page

Jack on T2 project

Rui Nuno Capela forum on qt sound apps

jack and qjackctl thread

ALSA, MIDI, JACK II oder auch RELOADED thread (German)