Use the following example as a guide to configure your mpd.conf on the Alix (in particular the text in red). Read this post first !
Nota bene : the important lines are the ones which are uncommented (in red text), i.e. the ones which have no # at the beginning of the line. The lines which have a # at the beginning of the line will be ignored by mpd. The green text is text you have to adapt to your own case (i.e. your own username or your own USB DAC's name).
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# An example configuration file for MPD
# See the mpd.conf man page for a more detailed description of each parameter.
######################## REQUIRED PATHS ########################
# You can put symlinks in here, if you like. Make sure that
# the user that mpd runs as (see the 'user' config parameter)
# can read the files in this directory.
music_directory "/mnt/nfs/mpd_music"
playlist_directory "/mnt/nfs/mpd/playlists"
db_file "/mnt/nfs/mpd/tag_cache"
log_file "/mnt/nfs/mpd/mpd.log"
error_file "/mnt/nfs/mpd/errors.log"
pid_file "/mnt/nfs/mpd/pid"
################################################################
######################## OPTIONAL PATHS ########################
#
# If specified, MPD will save its current state (playlist,
# current song, playing/paused, etc.) at exit. This will be
# used to restore the session the next time it is run.
#
state_file "/mnt/nfs/mpd/state"
#
################################################################
######################## DAEMON OPTIONS ########################
#
# If started as root, MPD will drop root privileges and run as
# this user instead. Otherwise, MPD will run as the user it was
# started by. If left unspecified, MPD will not drop root
# privileges at all (not recommended).
#
user "your_username"
#
# The address and port to listen on.
#
# For privacy, we default to the loopback interface. In Debian, "localhost"
# may resolve to both an IPv4 and an IPv6 address. For MPD 0.13 or earlier,
# it is recommended to only use one or the other.
#
bind_to_address "any"
port "6601"
#
# Controls the amount of information that is logged. Can be
# "default", "secure", or "verbose".
#
#log_level "default"
#
################################################################
########################## PERMISSIONS #########################
#
# MPD can require that users specify a password before using it.
# You may specify one ore more here, along with what users who
# log in with that password are allowed to do.
#
#password "password@read,add,control,admin"
#
# Specifies what permissions a user who has not logged in with a
# password has. By default, all users have full access to MPD
# if no password is specified above, or no access if one or
# more passwords are specified.
#
#default_permissions "read,add,control,admin"
#
################################################################
########################## AUDIO OUTPUT ########################
#
# MPD supports many audio output types, as well as playing
# through multiple audio outputs at the same time. You can
# specify one or more here. If you don't specify any, MPD will
# automatically scan for a usable audio output.
#
# See
# for examples of other audio outputs.
#
# An example of an ALSA output:
#
audio_output {
type "alsa"
name "your_USB_DAC's_name"
device "hw:0,0" # optional
# format "44100:16:2" # optional
#}
#
# An example of an OSS output:
#
#audio_output {
# type "oss"
# name "My OSS Device"
# device "/dev/dsp" # optional
# format "44100:16:2" # optional
#}
#
# An example of a shout output (for streaming to Icecast):
#
#audio_output {
# type "shout"
# name "My Shout Stream"
# host "localhost"
# port "8000"
# mount "/mpd.ogg"
# password "hackme"
# quality "5.0"
# bitrate "128"
# format "44100:16:1"
# user "source" # optional
# description "My Stream Description" # optional
# genre "jazz" # optional
# public "no" # optional
#}
#
# Force all decoded audio to be converted to this format before
# being passed to the audio outputs.
#
#audio_output_format "44100:16:2"
#
################################################################
############################# MIXER ############################
#
# MPD needs to know what mixer settings to change when you
# adjust the volume. If you don't specify one here, MPD will
# pick one based on which ones it was compiled with support for.
#
# An example for controlling an ALSA mixer:
#
#mixer_type "alsa"
#mixer_device "default"
#mixer_control "PCM"
#
# An example for controlling an OSS mixer:
#
#mixer_type "oss"
#mixer_device "/dev/mixer"
#mixer_control "PCM"
#
# If you want MPD to adjust the volume of audio sent to the
# audio outputs, you can tell it to use the software mixer:
#
#mixer_type "software"
#
################################################################
######################### NORMALIZATION ########################
#
# Specifies the type of ReplayGain to use. Can be "album" or
# "track". ReplayGain will not be used if not specified. See
#
#
#replaygain "album"
#
# Sets the pre-amp used for files that have ReplayGain tags.
#
#replaygain_preamp "0"
#
# Enable on the fly volume normalization. This will cause the
# volume of all songs played to be adjusted so that they sound
# as though they are of equal loudness.
#
#volume_normalization "no"
#
################################################################
########################### BUFFERING ##########################
#
# The size of the buffer containing decoded audio. You probably
# shouldn't change this.
#
#audio_buffer_size "2048"
#
# How much of the buffer to fill before beginning to play.
#
buffer_before_play "100%"
#
# Similar options for the HTTP stream buffer. If you hear
# skipping while playing HTTP streams, you may wish to increase
# these.
#
#http_buffer_size "128"
#http_prebuffer_size "25%"
#
################################################################
########################### HTTP PROXY #########################
#
# Specifies the HTTP proxy to use for playing HTTP streams.
#
#http_proxy_host "proxy.isp.com"
#http_proxy_port "8080"
#http_proxy_user "user"
#http_proxy_password "password"
#
################################################################
############################# LIMITS ###########################
#
# These are various limits to prevent MPD from using too many
# resources. You should only change them if they start
# restricting your usage of MPD.
#
#connection_timeout "60"
#max_connections "5"
#max_playlist_length "16384"
#max_command_list_size "2048"
#max_output_buffer_size "8192"
#
################################################################
###################### CHARACTER ENCODINGS #####################
#
# If file or directory names do not display correctly, then you
# may need to change this. In most cases it should be either
# "ISO-8859-1" or "UTF-8". You must recreate your database
# after changing this (use mpd --create-db).
#
filesystem_charset "UTF-8"
#
# The encoding that ID3v1 tags should be converted from.
#
id3v1_encoding "UTF-8"
#
################################################################
######################### OTHER OPTIONS ########################
#
# The metadata types MPD will recognize.
#
metadata_to_use "artist,album,title,track,name,genre,date,composer,performer, disc"
#
# Enable this if you wish to use your MPD created playlists in
# other music players.
#
#save_absolute_paths_in_playlists "no"
#
################################################################
