I know this is probably kind of out there but I am trying to get my DAC+ to work with my RPI 2B and lightshowpi.
I enabled the overlay(dtoverlay=hifiberry-dacplus) , but am not sure what I should be putting in /etc/asound.conf.
This is what works for lightshowpi with the built-in soundcard of the PI:
type file # File PCM
slave.pcm "hw:0,0" # This should match the playback device at /proc/asound/devices
file /tmp/audio # Output filename
format raw # File format ("raw" or "wav")
perm 0777 # Output file permission (octal, def. 0777)