JACK is a low-latency audio server, written primarily for Linux. It can connect a number of different applications to an audio device, as well as allow them to share audio among themselves. Its clients can run in their own processes (ie. as a normal application) or they can run within a JACK server instance (i.e. as a "plugin"). Jack uses /dev/shm as a temporary directory for its processes; this is a relatively new change, as it used to use /mnt/ramfs. You may pass an alternate location as JACKTMP when executing the script. For example: JACKTMP=/mnt/tmp jack-audio-connection-kit.SlackBuild Assuming you use the default /dev/shm as temporary directory, be sure you have an appropriate line in /etc/fstab to mount it: tmpfs /dev/shm tmpfs defaults 0 0 If you don't accept the script's default, you'll need to have the appropriate mountpoint set up in fstab and mounted, but a discussion of how to do that is outside the scope of this document. jackd has to run with realtime priviledges. One way to do this on Slackware would be to use set_rlimits. Since 12.2 there's another way, though experimental. If you have a filesystem that supports posix capabilities (reiserfs does not), you can grant jackd the rights to run in realtime mode, even when started as normal user with the following command: setcap cap_sys_nice=ep /usr/bin/jackd jack optionally uses libsndfile which is also available at SlackBuilds.org.