you need the the driver to connect headphone to 0x25 to provide an
indepdent volum control at node 0x26


does your motherboard support multi streaming 7.1 + 2 ?

www.intel.com/support/motherboards/desktop/sb/cs-020642.htm#multistream

Node 0x25 [Audio Output] wcaps 0x11: Stereo
  Converter: stream=0, channel=0
  PCM:
    rates [0x560]: 44100 48000 96000 192000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM


Node 0x26 [Audio Mixer] wcaps 0x20010f: Stereo Amp-In Amp-Out
  Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-In vals:  [0x00 0x00] [0x80 0x80]
  Amp-Out caps: ofs=0x1f, nsteps=0x1f, stepsize=0x05, mute=0
  Amp-Out vals:  [0x00 0x00]
  Connection: 2
     0x25 0x0b

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https://bugs.launchpad.net/bugs/827193

Title:
  Asus M3A78-EM / Realtek ALC1200 - output selection SNAFU

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