Now I boot from LiveCD. 
1) I did not do anything with sound preferences. File: amixer_LiveCD_boot.txt.

2) I started gnome-sound-recorder, record my voice,  and I heared it
when press "play" button at the program. Capture worked. File:
gnome_sound_recorder_LiveCD.txt

3) I change mic sensitivity to Up at sound preferences. File:
amixer_LiveCD_boot_record_micUP.txt.

4) I mute mic at sound preferences. File:
amixer_LiveCD_boot_record_micMUTE.txt

There are different parts at amixer snapshots:
1) File: amixer_LiveCD_boot.txt
...
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 31
  Front Left: Capture 0 [0%] [-12.00dB] [on]
  Front Right: Capture 0 [0%] [-12.00dB] [on]
...

2) File: amixer_LiveCD_boot_record_micUP.txt
...
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 31
  Front Left: Capture 27 [87%] [28.50dB] [on]
  Front Right: Capture 27 [87%] [28.50dB] [on]
...

3) File: amixer_LiveCD_boot_record_micMUTE.txt
...
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 31
  Front Left: Capture 27 [87%] [28.50dB] [off]
  Front Right: Capture 27 [87%] [28.50dB] [off]
...

** Attachment added: "amixer_LiveCD_boot.txt"
   http://launchpadlibrarian.net/35860037/amixer_LiveCD_boot.txt

-- 
Sound capture (microphone) works on LiveCD, but don't work after installation
https://bugs.launchpad.net/bugs/460351
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