sudo apt-get update -y

sudo apt-get install -y libasound2-plugin-equal

aplay -l

cd /etc
sudo nano -w asound.conf

ctl.equal {
  type equal;
}

pcm.plugequal {
  type equal;
  # Modify the line below if you don't
  # want to use sound card 0.
  slave.pcm "plughw:1,0";
  # or if you want to use with multiple applications output to dmix
  # slave.pcm "plug:dmix"
}

#pcm.equal {
  # Or if you want the equalizer to be your
  # default soundcard uncomment the following
  # line and comment the above line.
pcm.!default {
  type plug;
  slave.pcm plugequal;
}

cd /etc
sudo nano mpd.conf

# Audio Output ################################################################
audio_output {
  ...
                # device        "hw:1,0"
                device          "plug:plugequal" 
  ...  
}              

sudo -H -u mpd alsamixer -D equal