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DAC+ No Sound

 I can't get sound from my DAC+. I have managed to get my Raspberry Pi to see the device, and when I try to play sound everything looks like it should work, but no sound comes out.

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0

 $ cat /etc/asound.conf
pcm.!default {
type hw card 0
}

ctl.!default {
type hw card 0
}

dmesg | grep hifi
[ 5.955613] snd-rpi-hifiberry-dacplus soc:sound: ASoC: CPU DAI (null) not registered - will retry
[ 5.961925] snd-rpi-hifiberry-dacplus soc:sound: ASoC: CODEC DAI pcm512x-hifi not registered - will retry
[ 6.307546] snd-rpi-hifiberry-dacplus soc:sound: pcm512x-hifi <-> 3f203000.i2s mapping ok

$ aplay LRMonoPhase4.wav
Playing WAVE 'LRMonoPhase4.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo

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