def increaseVolume (sound):
  for sample in getSamples (sound):
    ampl = getSample (sample)
    setSample (sample, ampl *2)


def driver1():
  file = pickAFile()
  s = makeSound (file)
  increaseVolume (s)
  play (s)
  writeSoundTo (s, pickAFile() )

def driver2():
  file = pickAFile()
  s = makeSound (file)
  play (s)
  return s

def normalize(sound):
    largest = 0
    for s in getSamples(sound):        
       largest = max(largest, abs(getSample(s)) ) #Notice the abs!
    multiplier = 32767.0 / largest

    print "Largest sample value in original sound was",  largest 
    print "Multiplier is", multiplier   

    for s in getSamples(sound):      
        louder =  multiplier * getSample(s)  
        setSample(s,louder)  

def driver3():
  file = pickAFile()
  s = makeSound (file)
  normalize (s)
  play (s)
  writeSoundTo (s, pickAFile() )