Rewrite the echo function to generate two echoes back, each delay samples previous. (Hint: Start your index loop at 2*delay + 1, then access one echo sample at index-delay and another at index - 2*delay.)

What will be an ideal response?

```
def echo2(delay ,s1):
s2 = duplicateSound(s1)
for index in range(2*delay+1 , getLength(s1)):
# set delay value to original value + delayed value * .6
echoSample = 0.6*getSampleValueAt(s2, index-delay)
echoSample2 = 0.6*getSampleValueAt(s2, index-2*delay)
comboSample = getSampleValueAt(s1,index) + echoSample+echoSample2
setSampleValueAt(s1, index,comboSample)
play(s1)
return s1
```