Simple mixer control 'Master',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined
  Playback channels: Mono
  Limits: Playback 0 - 255
  Mono: Playback 202 [79%] [-13.25dB] [on]


pulseaudio only use the above volume control and ignore those"Analog xxx 
Playback Volume"

you need to change the driver or add "[Element Analog xxx] to pulseaudio
conf file

http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths
/analog-output.conf


304|   0.000) D: [pulseaudio] alsa-mixer.c: Path analog-output (Analog Output), 
direction=1, priority=99, probed=yes, supported=yes, has_mute=yes, 
has_volume=yes, has_dB=yes, min_volume=0, max_volume=255, min_dB=-100000, 
max_dB=0
(   0.304|   0.000) D: [pulseaudio] alsa-mixer.c: Element Master, direction=1, 
switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, 
required_absent=0, mask=0x7ffffffffffff, n_channels=1, override_map=yes
(   0.304|   0.000) D: [pulseaudio] alsa-mixer.c: Element IEC958, direction=1, 
switch=2, volume=0, volume_limit=-1, enumeration=0, required=0, required_any=0, 
required_absent=0, mask=0x0, n_channels=0, override_map=no

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https://bugs.launchpad.net/bugs/1497666

Title:
  No right channel sound on Creative Xtreme Audio (CA0106)  in  Ubuntu
  14.04-15.10

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