JAMin is the JACK Audio Connection Kit (JACK) Audio Mastering interface. JAMin is an open source application designed to perform professional audio mastering of stereo input streams. It uses LADSPA for digital signal processing (DSP). JAMin is licensed under the GPL.

JAMin features:

Here are some screenshots of JAMin in action:

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JAMin in pair with Ardour HDEQ EQ
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Spectrum analyzer Compressor