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Adding two sounds and removing noise from a signal

# Blend sound1 with sound2.
# In other words, add sound2 into sound1
def blend(sound1, sound2):
  if getLength(sound1) >= getLength(sound2):
    for position in range(1, getLength(sound2)):
      s1 = getSampleValueAt(sound1, position)
      s2 = getSampleValueAt(sound2, position)
      setSampleValueAt(sound1, position, s1 + s2)
  else:
    for position in range(1, getLength(sound1)):
      s1 = getSampleValueAt(sound1, position)
      s2 = getSampleValueAt(sound2, position)
      setSampleValueAt(sound2, position, s1 + s2)

# Clean a known noise source from an input signal.
def clean(signalPlusNoise, noise):
  for position in range(1, getLength(signalPlusNoise)):
    if position <= getLength(noise):
      s = getSampleValueAt(signalPlusNoise, position)
      n = getSampleValueAt(noise, position)
      setSampleValueAt(signalPlusNoise, position, s-n)
  #signalPlusNoise is now just the signal

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