Mine

#!/bin/bash
#
# Script to handle the multimedia buttons
# and switch interfaces between local speakers, headphones, and music server
#
if [ $# -eq 0 ]
then
  exit 1
fi

sound=`cat ~/.sound.val`

if [ $1 = -vol ]
then
  if [ $2 = up ]
  then
    val="1+"
  elif [ $2 = down ]
  then
    val="1-"
  elif [ $2 = mute ]
  then
    val="toggle"
  else
    exit 1
  fi

  if [ $sound = 1 ]
  then   
    amixer set Master $val
  elif [ $sound = 2 ]
  then
    amixer set Headphone $val
  elif [ $sound = 3 ]
  then
    exit 1   # Place holder for the music server
  fi
fi

if [ $1 = -play ]
then
  if [ $sound = 3 ] 
  then
    exit 1
  else
    amarok --play-pause
  fi
fi

if [ $1 = -prev ]
then
  if [ $sound = 3 ]
  then
    exit 1
  else
    amarok --previous
  fi
fi

if [ $1 = -next ]
then
  if [ $sound = 3 ]
  then
    exit 1
  else
    amarok --next
  fi
fi

if [ $1 = -stop ]
then
  if [ $sound = 3 ]
  then
    exit 1
  else
    amarok --stop
  fi
fi

if [ $1 = -sel ]
then 
  if [ $2 = speakers ]
  then
    echo 1 > ~/.sound.val
    echo Interface changed to speakers
  elif [ $2 = headphones ]
  then
    echo 2 > ~/.sound.val
    echo Interface changed to headphones
  elif [ $2 = music_server ]
  then
    echo 3 > ~/.sound.val
    echo Interface changed to music server
  else
    exit 1
  fi
fi