PiMusicBox working with HiFiBerry DAC+

In addition to the distribution and Raspberry Pi kernel updates, to get PiMusicBox working with HiFiBerry DAC+ (and similarly for IQAudio and other DAC HATs) you must change /boot/config/settings.ini to the following settings (only the relevant ones are shown).

sudo nano /boot/config/settings.ini

# ------------------
# | Audio Settings |
# ------------------
# Because of limitations with some USB-DACs, MusicBox downsamples USB sound to 44k by default. Set to false   to disable.
downsample_usb = false

# Set default output. This overrides the automatic detection (which sets to usb audio if an usb audio device
# is found, else to hdmi (if hdmi is connected at boot), and otherwise just to the analog out)
# i2s (HifiBerry et all) is not detected automatically. Set it here to be able to use it.
# Options: analog, hdmi, usb, hifiberry_dac, hifiberry_digi, hifiberry_dacplus, iqaudio_dac, wolfson (wolfson needs different kernel)
output = hifiberry_dacplus

# Set the startup volume of MusicBox
# Values: from 0 to 100
mixer_volume = 43

# --------------------------------------------------------------------------
# | OTHER Settings                                                         |
# | You probably don't want to edit the settings below this line. Really.  |
# | Unless you know what you're doing, or you want to change the webclient |
# --------------------------------------------------------------------------
# This sets the gstreamer buffer. It's a bit tricky...
# If you have problems with stuttering sound, try other values here, like:
# or
#output = alsasink buffer-time=300000 latency-time=20000 
#output = alsasink buffer-time=200000 latency-time=10000
#output = alsasink

#mixer = autoaudiomixer
mixer = software

#optionally, you can use alsamixer. This enables you to use hardware mixers of usb/audiocards.
#Set the previous setting to:
#mixer = alsamixer
#And set the card and control below. E.g.
#card = 1
#control = Master
#Run the command 'amixer scontrols' from the commandline to list available controls on your system
#See https://github.com/mopidy/mopidy-alsamixer

card = 0
control = DSP Program

enabled = true
protocols = http, https, mms, file, rtmp, rtmps, rtsp, udp, mmsh

# -------------
# | Webclient |
# -------------
# Here you can change the default webclient
# options: /opt/webclient /opt/moped
static_dir = /opt/webclient

enabled = true
#musicbox = true

If you still are having problems, look in the Mopidy log file to see if there are any error messages.

cat /var/log/mopidy/mopidy.log

####What is Mopidy?
Mopidy is an extensible music server written in Python. It is used by PiMusicBox to play music from a local disk, Spotify, SoundCloud, Google Play Music, and other streaming services. You can edit the playlist from any phone, tablet, or computer using a range of MPD and web clients.

Source: https://discuss.mopidy.com/t/attached-new-hifiberry-dac-but-now-musicbox-local-stopped-working/519/12