MelMatchEQ is a profiling EQ in LV2 plugin format, using a 26 step Mel Frequency Band. It could analyze the spectral profile of 2 sound sources, and calculate the needed EQ settings so that there profile in the Mel spectrum match each other. The dsp is mainly written in Faust. The GUI use plain X11 with cairo bindings. It's released under the GPL more info here: https://github.com/brummer10/MelMatchEQ.lv2/tree/master