di you try to tweak you mpd.conf file ?
something like this :

http://crunchbang.org/forums/v.....p?id=17386

audio_output {
type "alsa"
name "My ALSA EQ"
auto_resample "no"
use_mmap "yes"
device "plug:plugequal"
format "44100:16:2" # optional
mixer_device "default" # optional
mixer_control "PCM" # optional
mixer_index "0" # optional
}

ctl.equal {
type equal;
}
pcm.plugequal {
slave.pcm "plughw:1,0";
}
pcm.!default {
type plug;
slave.pcm plugequal;
}

http://www.thedigitalmachine.n.....equal.html

So I follow the instructions but when all is installed the RaspyFi webpage refuses to load, it seems something isn't starting up properly.

What I've done is the following as root in the directory /root

$ apt-get update
$ apt-get install build-essential caps libasound2-dev libasound2-plugins
$ wget http://www.thedigitalmachine.n......6.tar.bz2
$ tar -xjvvf alsaequal-0.6.tar.bz2
$ cd alsaequal
$ make clean
$ make
$ sudo ln -s /usr/lib/arm-linux-gnueabihf/alsa-lib /usr/lib/
$ make install
$ make clean

Create file by:
$ nano /root/.asoundrc

and paste this into file and then ctrl-X to save
----------------------------------------------------
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;
}
----------------------------------------------------

Finish off with:

$ alsa force-reload
$ alsamixer -D equal

As long as I choose the correct hw in the .asoundrc so the USB DAC is the primary output I can get sound out of it with the command "speaker-test". But... I'm not sure if there is something that needs to be corrected in the .asoundrc to get mpd and the web page working? I've tried a bunch of different variants but never got the webpage and mpd stuff to get started.

It might be something in relation to this text in the setup instructions?
"You will also probably need to pump the data through a plug to change the format to float, which is all alsaequal supports."

I would LOVE to get this addon one up and running so any help is deeply appreciated!!