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ALSA problem

http://processors.wiki.ti.com/index.php/DM81xx_AM38xx_Audio_Driver_User_Guide 

This command don't work for tlv320aic and i can't find it in asound.state 

$ amixer sset ‘Right PGA Mixer Mic3L’ on/off
$ amixer sset ‘Right PGA Mixer Mic3R’ on/off
$ amixer sset ‘Left PGA Mixer Mic3L’ on/off
$ amixer sset ‘Left PGA Mixer Mic3R’ on/off

$ amixer sset 'Right PGA Mixer Line1R' on/off
$ amixer sset 'Right PGA Mixer Line1L' on/off
$ amixer sset 'Left PGA Mixer Line1R' on/off
$ amixer sset 'Left PGA Mixer Line1L' on/off 

 How i can  mute line in?

Also if i run

# gst-launch audiotestsrc freq=2000 volume=0.1 ! alsasrc &

# gst-launch audiotestsrc freq=3000 volume=0.1 ! alsasrc 

The second command say that device is busy. ALSA can't mixing streams?