the amp out conncted to CD node 0x16 should be muted or create a CD playback 
switch 

Node 0x19 [Audio Mixer] wcaps 0x20050b: Stereo Amp-In
  Control: name="Mic Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=2, ofs=0
  Control: name="Mic Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=2, ofs=0
  Amp-In caps: ofs=0x17, nsteps=0x1e, stepsize=0x05, mute=1
  Amp-In vals:  [0x17 0x17] [0x80 0x80] [0x80 0x80] [0x17 0x17]
  Power states:  D0 D1 D2 D3
  Power: setting=D0, actual=D0
  Connection: 4
     0x10 0x1b 0x1a 0x16

Node 0x16 [Pin Complex] wcaps 0x400401: Stereo
  Pincap 0x00000060: IN Balanced
  Pin Default 0x94330121: [Fixed] CD at Int Right
    Conn = ATAPI, Color = Unknown
    DefAssociation = 0x2, Sequence = 0x1
    Misc = NO_PRESENCE
  Pin-ctls: 0x20: IN
  Power states:  D0 D1 D2 D3
  Power: setting=D0, actual=D0

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https://bugs.launchpad.net/bugs/953303

Title:
  [HP Pavilion dv2000 (RN067EA#ABB), Conexant CX20551 (Waikiki), Black
  Headphone Out, Front] Sound is distorted

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