if [ -f $1 ]
then
  if [ ! -z $2 ]
  then
  L=/sys/kernel/sound_control_3/gpl_sound_control_locked
  val=$2
  addval=$(($2 + $2))
  checksum=$((255 - $addval))
    if (("$checksum" > "255"))
    then
    checksum=$(($checksum - 256))
    val=$(($val + 256))
    fi
    echo 0 > $L
    echo $val $val $checksum > $1
    echo 1 > $L
  fi
  sound=`cat $1 | awk '{ print $1}'`
  if (("$sound" > "50"))
    then
    sound=$(($sound - 256))
  fi
  echo $sound
fi
