try alsamixer -c1

Simple mixer control 'Headphones Impedance',0
  Capabilities: penum
  Items: '< 64 ohms' '64-300 ohms' '300-600 ohms'
  Item0: '< 64 ohms'

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https://bugs.launchpad.net/bugs/1079279

Title:
  Ubuntu 12.04 sound [AV200 - Xonar STX, playback] Sound is distorted

Status in “alsa-driver” package in Ubuntu:
  New

Bug description:
  1.
  Ubuntu DTS (movie) sound (trough Alsa or Pulse) at low frequencies are 
severely distorted.
  This problem has persisted for several Ubuntu releases. (win7 does not have 
this problem).

  2.
  I have an Asus Xonar Essence STX (pci-e) sound card/headphone amp. In ubuntu 
10.10 it was possible to adjust the impedance level of the headphones in the 
preferred mixer application (i.e. Gnome-Alsa mixer). This very, very important 
adjustment option have for reasons unknown been removed after Ubuntu 10.10. 

  Is it possible to get this feature back?

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
  Uname: Linux 3.2.0-32-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu14
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  peter      1963 F.... pulseaudio
   /dev/snd/controlC0:  peter      1963 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'NVidia'/'HDA NVidia at 0xfe9fc000 irq 17'
     Mixer name : 'Nvidia GPU 14 HDMI/DP'
     Components : 'HDA:10de0014,10de0101,00100100'
     Controls      : 24
     Simple ctrls  : 4
  Card1.Amixer.info:
   Card hw:1 'STX'/'Asus Virtuoso 100 at 0xd800, irq 16'
     Mixer name : 'AV200'
     Components : 'PCM1792A CS5381 AV200'
     Controls      : 24
     Simple ctrls  : 14
  Date: Thu Nov 15 18:23:35 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:STX successful
  Symptom_Card: CMI8788 [Oxygen HD Audio] - Xonar STX
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: Digital clip or distortion, or "overdriven" sound
  Title: [AV200 - Xonar STX, playback] Sound is distorted
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/20/2007
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0901
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: Maximus Formula
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0901:bd11/20/2007:svnSystemmanufacturer:pnMaximusFormula:pvrSystemVersion:rvnASUSTeKComputerINC.:rnMaximusFormula:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: Maximus Formula
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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