Qjackctl

QjackCtl is a simple application to control JACK. It provides a simple GUI dialog for setting several JACK daemon parameters, which are properly saved between sessions, and a way control of the status of the audio server daemon. With time, this primordial interface has become richer by including a enhanced patchbay and connection control features.

Most Pro-Audio applications require Jack for low-latency audio processing. QjackCtl is a handy tool for controlling and showing JACK status. Make sure you get familiar with this app and in particular if you need to toggle with different sampling rates on your audio hardware.