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asound.conf /etc/asound.conf これはdefault ではないので作ります
$ sudo touch /etc/asound.conf


pcm.!default {
type hw card 0
}
ctl.!default {
type hw card 0





$ /boot/firmware/config.txt
の内容
ーー
　# For more options and information see
# http://rptl.io/configtxt
# Some settings may impact device functionality. See link above for details

# Uncomment some or all of these to enable the optional hardware interfaces

enable i2s

dtparam=i2c_arm=on
dtparam=i2s=on
dtparam=spi=on

#hdmi_drive=2
# Enable audio (loads snd_bcm2835)
#dtparam=audio=on

# Additional overlays and parameters are documented
# /boot/firmware/overlays/README
# Additional overlays and parameters are documented /boot/overlays/README
#turn wifi and bluetooth off
#dtoverlay=pi3-disable-wifi
#dtoverlay=pi3-disable-bt

# Automatically load overlays for detected cameras
#camera_auto_detect=1

# Automatically load overlays for detected DSI displays
#display_auto_detect=1

# Automatically load initramfs files, if found
#auto_initramfs=1

# Enable DRM VC4 V3D driver
#dtoverlay=vc4-kms-v3d

max_framebuffers=2

----------------------------------------------------------------

# Don't have the firmware create an initial video= setting in cmdline.txt.
# Use the kernel's default instead.
disable_fw_kms_setup=1

# Run in 64-bit mode
arm_64bit=1

# Disable compensation for displays with overscan
disable_overscan=1

# Run as fast as firmware / board allows
arm_boost=1

[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
#otg_mode=1

[cm5]
#dtoverlay=dwc2,dr_mode=host

[all]

dtoverlay=hifiberry-dac,slave=true
dtoverlay=hifiberry-digi,slave=true
initramfs initrd.img-4.19.97-v7+-overlay

-------------------------------------------------------------------------
/etc/mpd.conf
///////////////////////////////////////////////

music_directory "/var/lib/mpd/music"
playlist_directory "/var/lib/mpd/playlists"
db_file "/var/lib/mpd/database"
#log_file "/var/log/mpd/mpd.log"
#pid_file "/var/run/mpd/pid"
#state_file "/mnt/dietpi_userdata/.mpd_cache/state"
#sticker_file "/mnt/dietpi_userdata/.mpd_cache/sticker.sql"

#user "mpd" #Set via service to allow for mpd user to use assigned groups "audio" and "dietpi"
#group "dietpi" #Set via service to allow for mpd user to use assigned groups "audio" and "dietpi"
user "mpd"
group "audio"
bind_to_address "0.0.0.0"

port "6600"
log_level "default"
#gapless_mp3_playback "yes"
# save_absolute_paths_in_playlists "no"
metadata_to_use "artist,album,title,track,name,genre,date"
#auto_update "yes"
#auto_update_depth "3"

follow_outside_symlinks "yes"
follow_inside_symlinks "yes"

zeroconf_enabled "yes"
zeroconf_name "raspberrypi"

#password "password@read,add,control,admin"
#default_permissions "read,add,control,admin"

input {

plugin "curl"
#proxy "proxy.isp.com:8080"
#proxy_user "user"
#proxy_password "password"

}

connection_timeout "30"
max_connections "20"
max_playlist_length "81920"
max_command_list_size "81920"
max_output_buffer_size "81920"
audio_buffer_size "4096"
filesystem_charset "UTF-8"
#audio_output_format "44100:16:2"
#id3v1_encoding "UTF-8"

#Audio Output / Processing

#Disabled to allow native DSD output
# replaygain "track"
# replaygain_preamp "8"
volume_normalization "yes"

#buffer_before_play "10%"
filter {
plugin "volume"
name "software volume"
}
#######################################################################
#resampler {
# plugin "soxr"
# quality "very high"
# threads "0"
resampler {
plugin "soxr"
quality "custom"
precision "16"
phase_response "50"
passband_end "91.3"
stopband_begin "100"
attenuation "0"
flags "0"

}
#######################################################################
playlist_plugin {
name "m3u"
enabled "true"
}
########################################################################
decoder {
plugin "wildmidi"
enabled "no"
}


decoder {
plugin "ffmpeg"
enabled "yes"
}

input {
plugin "curl"
}


######################################################################

# audio_output {

# type "alsa"
# name "SPDIF"
# device "hw:SPDIF,0"
# mixer_type "software"
# dop "yes"
# audio_output_format "44100:16:2"
#}



#audio_output {
#type "alsa"
#name "DIY PCM5102a"
#device "hw:Pcm5102a,0"
#mixer_type "software"
#format "*:32:2"
#replay_gain_handler "software"
#dop "yes"
#}


audio_output {

type "alsa"
name "Hifiberry-dig"
device "hw:0,0"
mixer_type "software"
dop "yes"
format "44100:16:2"
}

///////////////////////////////////////

/usr/lib/systemd/system/mpd.service

１０行目あたりにある


　ExecStart=/usr/bin/mpd --systemd $MPDCONF /etc/mpd.conf
　最後に　/etc/mpd.conf を追加する

///////////////////////////////////////
後は、ｍｐｄをリスタートするとか　enable にするとか
　は一般的な確認です。

//////////////////////////////////////
systemctl status mpd ///// mpd の状態を確認します。

　systemctl restart mpd ////// mpd のリスタートです。これでreboot しなくても済ます。
　一度　reboot したほうが良いかもしれません。
　Hostの名前を変更するには　/etc/hosts //////Hostmname を変更します。
/etc/hosts の中の名称も同じにした方が良いかもしれません、
　これで音が出ます、正しこれは　SPDIF の場合です。ドーターボードは Hifiberry-digi の基板です。
　Justboom のdigi 基板の場合も同じです。この基板は　I２S　と　I2Cを使います。
　その設定は　config.txt の内容を変更して下さい。

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