Write a function to add 1 second of silence to the beginning of a sound. It should take the sound as input, create the new empty target sound, then copy the original sound starting after the first second in the target.
Note: The sampling rate has to be of type int if its going to work with index array notation.
```
def addStartSilence(sound):
sampleRate = int(getSamplingRate(sound))
target = makeEmptySound(sampleRate+getLength(sound))
targetSamples = getSamples(target)
sourceSamples = getSamples(sound)
for index in range(0, getLength(sound)):
sourceValue = getSampleValue(sourceSamples[index])
setSampleValue(targetSamples[sampleRate+index] ,sourceValue)
return target
```
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