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[Raymond <1433382@xxxxxxxxxxxxxxxxxx>]

AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             4
        wTerminalType      0x0603 Line Connector
        bAssocTerminal          0
        bNrChannels             2
        wChannelConfig     0x0003
          Left Front (L)
          Right Front (R)
        iChannelNames           0 
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID             6
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bSourceID               4
        iTerminal               0 


seem no  mixing with playback to out terminal speaker

this mean high latency when ypu use softeware for loopback

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https://bugs.launchpad.net/bugs/1433382

Title:
  [USB-Audio - SB X-Fi Surround 5.1 Pro, playback] Static, crackling
  sounds using module-loopback

Status in alsa-driver package in Ubuntu:
  Incomplete

Bug description:
  I recently hooked up a SB X-Fi Surrount 5.1 Pro external sound card to
  my computer. It has a Line-In port which I wanted to use for playing
  audio from another computer. I enabled the loopback module like so:

     pactl load-module module-loopback

  And although I could then hear sound from Line-In, it was distorted by
  static, crackling sounds. I took the advice I found here:

     https://wiki.ubuntu.com/Audio/PositionReporting

  Making this change to /etc/pulse/default.pa:

     load-module module-udev-detect tsched=0

  After rebooting and again loading the loopback module, the playback
  was static-free. As instructed by the above webpage, I'm filing this
  bug to track the issue and suggested solution.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu1.1
  ProcVersionSignature: Ubuntu 3.2.0-77.114-generic 3.2.66
  Uname: Linux 3.2.0-77-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.8
  Architecture: amd64
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xfa620000 irq 95'
     Mixer name	: 'Realtek ALC898'
     Components	: 'HDA:10ec0899,104384d8,00100003'
     Controls      : 47
     Simple ctrls  : 23
  Card1.Amixer.info:
   Card hw:1 'Pro'/'Creative Technology Ltd SB X-Fi Surround 5.1 Pro at usb-0000:00:1d.0-1.3, high '
     Mixer name	: 'USB Mixer'
     Components	: 'USB041e:3237'
     Controls      : 0
     Simple ctrls  : 0
  Card1.Amixer.values:
   
  Card2.Amixer.info:
   Card hw:2 'NVidia'/'HDA NVidia at 0xfa080000 irq 36'
     Mixer name	: 'Nvidia GPU 16 HDMI/DP'
     Components	: 'HDA:10de0016,10de0101,00100100'
     Controls      : 24
     Simple ctrls  : 4
  Date: Tue Mar 17 21:02:47 2015
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
  MarkForUpload: True
  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:Pro successful
  Symptom_Card: GF114 HDMI Audio Controller - HDA NVidia
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: Underruns, dropouts, or "crackling" sound
  Title: [USB-Audio - SB X-Fi Surround 5.1 Pro, playback] Underruns, dropouts or crackling sound
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/10/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1104
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P9X79 PRO
  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.:bvr1104:bd04/10/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP9X79PRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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