media-plugins/alsaequal

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Homepage: http://www.thedigitalmachine.net/alsaequal.html
Description: a real-time adjustable equalizer plugin for ALSA

media-plugins/alsaequal-0.6-r2 from gentoo has been broken for a few years.
media-plugins/alsaequal-0.6-r3 from the following overlay works:
https://github.com/dimibyte/gentoo-overlay

Usage

Place the following code in ~/.asoundrc for a single user, or within /etc/asound.conf:

pcm.!default {
  type hw
  card 0
}

ctl.!default {
  type hw
  card 0
}

ctl.equal {
  type equal;
}

pcm.plugequal {
  type equal;
  slave.pcm "plughw:0,0";
}

pcm.!default {
  type plug;
  slave.pcm plugequal;
}

You can get the number of the audio card from the output of aplay -l.
If instead of using card 0, you are using card 1, replace the appropriate lines in the code above as follows:
//...
card 1
// ...
slave.pcm "plughw:1,0";
// ...

Then you can launch the mixer thus:

alsamixer -D equal

External resources