Mix Two Sounds

# This function blends 2 sounds.
def makeMix(sound1, sound2, mixValue1, mixValue2):
  newLength = min(getLength(sound1) ,getLength(sound2))
  newSound = makeEmptySound(newLength)
  for index in range(0,newLength):
    sample1 = getSampleValueAt (sound1, index)
    sample2 = getSampleValueAt (sound2, index)
    newSample = mixValue1*sample1 + mixValue2*sample2
    setSampleValueAt (newSound, index, newSample)
  return newSound