I have HiFiBerryDAC+. In Musicbox there are two files to change:
- Config .txt uncommment hiberry-dacplus
# Uncomment one of these lines to enable an audio interface
#dtoverlay=hifiberry-amp
#dtoverlay=hifiberry-dac
dtoverlay=hifiberry-dacplus
#dtoverlay=hifiberry-digi
dtdebug=1
#dtoverlay=iqaudio-dac
#dtoverlay=iqaudio-dacplus
- Settings.ini
In the part Audio Settings, put
output = hifiberry_dacplus
mixer_volume = 90
Save files, reboot, enjoy!