Crantila/FSC/SoundServers/JACK

What JACK Is, and Why It Exists

(no algorithms)

(no algorithms)

must refer to kernel/system optimization section
by default, in Fedora, when JACK is started, it receives control of the audio devices from PulseAudio. No PA device works until JACK quits

run 'yum install jack-audio-connection-kit qjackctl' (this installs JACK and a GUI application to control it, QjackCtl)
Approve the installation.
Run QjackCtl from the KMenu or Applications menu
to start JACK, press "Start"; to stop it press "Stop"
Use the "Messages" button to see messages, usually errors or warnings
Use the "Status" button to see various statistics

you need to adjust the settings

Press the "Setup" button
Run 'cat /proc/asound/cards' to see a list of sound cards in your system, and choose the one you want by name
Put (for example) 'hw:SB' in the "Interface" field (this is more robust, etc.)
Adjust the sample rate no higher than the highest supported by your interface; 44100 is CD quality; 48000 is probably sufficient for most uses
Go to the 'Options' tab, and deselect "Execute script on Startup: artsshell -q terminate", since it's not needed in KDE4 or GNOME

you should setup your system to do real-time operation

Add yourself, and anybody who uses JACK, to the audio group
Planet CCRMA's version of JACK automatically enables real-time priorities. To make it safer, edit '/etc/security/limits.conf' so that the final lines read:

 @audio - rtprio 99
 @audio - memlock 4194304
 @audio - nice -10