Just hacked together a Linux 10 band equalizer. Added voice level activation, frequency spectrum display, and an oscilloscope .... Supports ALSA, OSS, or reads and or writes directly from a wave file. Can process wave files at >> 1x speed too.
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Also you can run it without GUI in a script, and control it from an other instance with GUI.
Do not take this project to seriously..... It was just that something like this did not exist.