How to boost sound level in debian 7.2 64 bit

copy and paste text below at the end 

cd /

                                                               cd /etc/

touch asound.conf

nano asound.conf

or gedit

then add text to asound.conf

for nano

or gedit 

then type in terminal 

alsamixer

then 

them move PRE-AMP  arrow up or down

-------------------------------------------------------

-------------------------------------------------------------

 pcm.!default {

 type hw

 card 0

}

ctl.!default {

 type hw         

 card 0

}

pcm.!default {

      type plug

      slave.pcm "softvol"

  }

  pcm.softvol {

      type softvol

      slave {

          pcm "dmix"

      }

      control {

          name "Pre-Amp"

          card 0

      }

      min_dB -30.0

      max_dB 30.0

      resolution 6

  }

-----------------------------------------------------------------------------

the end