ALSA

media-plugins/alsaequal

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;

Firefox: ALSA and Pulseaudio

http://linux.overshoot.tv/www-client/firefox
USE=-pulseaudio : audio will not play without pulseaudio installed

ALSA support removed

In Firefox release 52, Mozilla disabled ALSA support by default and made Firefox default to Pulseaudio.

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