Important Jack Applications for Broadcast

Essential Control

KXStudio cadence – Master setup and control for Jack2, includes bundled utilities for patchbay, monitoring and session control
qJackctl – Alternative setup and control for Jack2 and patchbay configuration. Compatible with Cadence, this version has a much better user interface and has provision for saving patchbay setups.
jack_connect – connect a single patch at command line or in a script
jack_disconnect – disconnect a single patch at command line or in a script

Patchbay

KXStudio catia – Graphical patchbay – easy to use attractive and includes troubleshooting aids, but does not have a backup restore function
Patchage – Graphical patchbay
Patchmatrix – A different take on a patchbay with switching and gain control – midi and osc interface
JackSanity – a command line patchbay and transport configuration control for Jack (I have not checked this one out)

Mixers and Monitor Control

Non-Mixer – Incredibly flexible, Midi controlled extensible mixer for Jack. Each mixer strip is independent and groupable. Hosts audio plugins and interfaces with Non-Session control.
zita-mu1 – four input monitor control / PPM / Talkback application

Interconnection and monitoring

zita-njbridge – send audio from one computer to another on a local area network. Bridges are one way, but have any number of channels. There can be many instances of zita-njbridge running at once for bidirectional audio.
netjack2 – built in jack network connector. Hub and spoke system with master and slave. Slaves lose their ALSA connection, which can be restored with zita-ajbridge.
zita-ajbridge – connect any ALSA device into Jack (Jack natively connects to only a single sound card) This also resolves sound card clock issues.
ebumeter – Metering according to EBU R-128
meterbridge – Selectable types of sound level meters, stackable
silentjack – Execute a program on silence
jaaa – (JACK and ALSA Audio Analyser, is an audio signal generator and spectrum analyser designed to make accurate measurements.
openob – Can also be used on local networks for high quality two channel connections between computers.

Media Players

vlc – the computer audio-video “jack” of all trades. The biggest problem with vlc is that it has a million settings. It can play files, streams, playlists, etc. It can deliver them to jack, to icecast or shoutcast as a client, it can make rtsp:// streams. You need to read 50 pages of man file to understand how to do exactlly what you want.
madjack – a file player that could be looked at as a virtual cart machine. Has OSC controls so you can run it from an cellphone or tablet wirelessly using an OSC app like

Streamers and Internet Remote Sources

RadioTed