Change the shift method in Program to shiftFreq which takes a frequency instead of a factor, then plays the given sound at the desired frequency.
What will be an ideal response?
```
/**
* Method to change the frequency of a sound to the passed
* frequenc y
* @param f req the desired frequenc y
*/
public void s hiftFreq ( int freq)
{
double factor = this.getLength ( ) * (freq / this . getSampl ingRate ( ) ) ;
this. changeFreq2 (factor) ;
}
```
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