What is jack_mixer?
jack_mixer is a GTK+ JACK audio mixer app with a look similar to its hardware counterpart. It has lot of useful features, apart from being able to mix multiple JACK audio streams.
It is licensed under GPL version 2 (or later).
Features
- Mix any number of input channels (mono or stereo).
- Control balance and faders with MIDI commands.
- Handle session management with LASH.
- Create as many outputs as necessary.
- Quickly monitor inputs (PFL) and outputs.
- ...
Screenshots

Feedback
If you have trouble getting jack_mixer working, find a bug or you miss some feature, please submit a support request with the GNA issue tracker.
jack_mixer was initially written and supported by Nedko Arnaudov, it is now maintained by Frédéric Péters. You can reach Frédéric at fpeters (a.t) 0d (dot) be, and Nedko at nedko (a.t) arnaudov (dot) name. They can also be found in #lad on FreeNode (as fredp and nedko).
Last but not least the icon has been created by Lapo Calamandrei.