Adding an echo to a sound file(in JES)

I have to write a Python function, echo(thisFile), that creates an echo of a file, thisFile (thisFile is NOT a sound file), that first creates two sound files from thisFile, and in the 2nd sound file, add a copy of samples in the 1st file whose values are reduced by 60% and inserted into 16000-sample locations of the 1st file.

heres what i have so far but im not sure whats wrong with it at the moment. i am new to python, only about 2 weeks into the course.

def echo(delay):
f = pickAFile()
s1 = makeSound(f)
s2 = makeSound(f)
for p in range(delay+1, getLength(s1)):
setSampleValueAt(s1, p, getSampleValueAt( s1,p) +. 6*getSampleValueAt( s2, p-delay) )

return s1

if everything is good programing wise, how am i supposed to execute it in jes?

Clearly, use

play(s2)

or

blockingPlay(s2)

sounds good thank you. how would i go about executing it in JES?