jack: jack (A low-latency audio server) jack: jack: JACK is a low-latency audio server, written for POSIX conformant jack: operating systems such as GNU/Linux and Apple's OS X. It can connect a jack: number of different applications to an audio device, as well as jack: allowing them to share audio between themselves. JACK was designed jack: from the ground up for professional audio work, and its design focuses jack: on two key areas: synchronous execution of all clients, and low jack: latency operation. jack: jack: