jack1 (realtime low-latency sound server) 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"). Optional dependencies are libffado and celt. This conflicts with jack. Only install one of "jack" or "jack1". This is the "mature, stable" JACK1 branch. It's not 100% deprecated, but it no longer receives much attention from the upstream JACK developers. They recommend not using JACK1 at all, actually. Note: this build was formerly known as jack-audio-connection-kit. Before installing this, "removepkg jack-audio-connection-kit" if you had it installed. SBo build maintainers, please DO NOT list this as a dependency for your builds. If the software you're trying to build really does work with jack1 but not jack, please contact the jack maintainer (currently B. Watson . Include the build log and any runtime error messages in your email, plase. This package uses POSIX filesystem capabilities to execute with elevated privileges (required for realtime audio processing). This may be considered a security/stability risk. Please read http://www.slackbuilds.org/caps/ for more information. To disable capabilities, pass SETCAP=no to the script.