Echo a Sound

#This function will echo the sample in the sample's duration.
#I chose the delay to be 15800, because it sounded good at 15800.
def echo(delay):
  e1 = makeSound("yoursound.wav")
  e2 = makeSound("yoursound.wav")
  for index in range (delay, getLength(e1)):
    echoSample = 0.6*getSampleValueAt(e2, index-delay)
    comboSample = getSampleValueAt(e1, index) + echoSample
    setSampleValueAt(e1, index, comboSample)
  return e1