Note that pulse is attempting to use your digital playback device:

AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: hedge 3184 F.... pulseaudio
 /dev/snd/pcmC0D1p: hedge 3184 F...m pulseaudio  <---

which corresponds to:

card 0: NVidia [HDA NVidia], device 1: ALC262 Digital [ALC262 Digital]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

Are you certain that's the device you intend to use?  If not, check
Sound Preferences > Hardware > Profile *and* Output.

-- 
[Realtek ALC262] ALSA test tone not correctly played back
https://bugs.launchpad.net/bugs/666713
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