Simple mixer control 'Speaker',0
  Capabilities: pvolume pswitch pswitch-joined penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 151
  Mono:
  Front Left: Playback 0 [0%] [-28.37dB] [on]
  Front Right: Playback 0 [0%] [-28.37dB] [on]

it was bug of pulseaudio since usb audio really has playback volume

I: alsa-sink.c: Using 2.0 fragments of size 176400 bytes (1000.00ms), buffer 
size is 352800 bytes (2000.00ms)
I: alsa-sink.c: Time scheduling watermark is 20.00ms
D: alsa-sink.c: hwbuf_unused=0
D: alsa-sink.c: setting avail_min=87319
D: alsa-mixer.c: Activating path analog-output
D: alsa-mixer.c: Path analog-output (Analog Output), direction=1, priority=99, 
probed=yes, supported=yes, has_mute=yes, has_volume=no, has_dB=no, 
min_volume=0, max_volume=0, min_dB=0, max_dB=0
D: alsa-mixer.c: Element Speaker, direction=1, switch=1, volume=2, 
enumeration=0, required=0, required_absent=0, mask=0xbfaeb851eb851ebe, 
n_channels=2, override_map=no
I: alsa-sink.c: Driver does not support hardware volume control, falling back 
to software volume control.
I: alsa-sink.c: Using hardware mute control.

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https://bugs.launchpad.net/bugs/566449

Title:
  No Sound Through USB Headset

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