Hip-hop DJs spin turntables back and forth so that sections of sound are played forwards and backwards quickly. Try combining backwards play and frequency shifting to get the same effect. Play a second of a sound quickly forward, then quickly backward, two or three times. (You might have to move faster than just double the speed.)

Question

What will be an ideal response?

Answer 1

```
def djShift(sound):
sampleRate = getSamplingRate(sound)
#We're gonna have six seconds with a four times frequency
canvas = makeEmptySound(int(((sampleRate)*1.5)+4))

targetIndex = 0

for i in range(0, 6):
if i %2==0:
for index in range(0, sampleRate, 4):
sourceValue = getSampleValueAt(sound, index)
setSampleValueAt(canvas, targetIndex, sourceValue)
targetIndex= targetIndex+1
else:
for index in range(0, sampleRate, 4):
sourceValue = getSampleValueAt(sound, getLength(sound)-1-index)
setSampleValueAt(canvas, targetIndex, sourceValue)
targetIndex= targetIndex+1

play(canvas)
return canvas
```