=========================  QUICK EXERCISE: amplify by fixed amount

> Sound s = new Sound( "/Users/wallingf/Desktop/gettysburg10.wav" );
> s.play();
> s.amplify( 5 );
> s.play();
> s.amplify( 1500 );
> s.play();

* recall the range of values [-32768..32767]
* perhaps we need a bigger value to notice a change

> s = new Sound( "/Users/wallingf/Desktop/gettysburg10.wav" );
> s.amplify( 20000 );
> s.play();

* no change?

> s.displaySamples( 10 );
Sample at index 0 has value 20059
Sample at index 1 has value 20039
Sample at index 2 has value 20016
Sample at index 3 has value 20010
Sample at index 4 has value 19999
Sample at index 5 has value 20007
Sample at index 6 has value 19988
Sample at index 7 has value 19993
Sample at index 8 has value 20010
Sample at index 9 has value 20025

> s.explore();

* ah, a _shift_
* how about _this_

> s = new Sound( "/Users/wallingf/Desktop/gettysburg10.wav" );
> s.amplifyNotShift( 10000 );
> s.play();
> s.explore();


=========================  REVIEW: encoding of sound


* only one value, not three
* two bytes, not 1 or 3


=========================  EXERCISE: invert a sound


* like the negative of an image??

> s = new Sound( "/Users/wallingf/Desktop/gettysburg10.wav" );
> s.explore();
> s.invert();
> s.explore();

* is this a problem with us playing the "original sound?

> s.write( "/Users/wallingf/Desktop/gettysburg10-inverted.wav" );
> s = new Sound( "/Users/wallingf/Desktop/gettysburg10-inverted.wav" );
> s.play()

* no!

> s.amplify( 0.5 );
> s.explore();

* what might a real negative of a sound look like??
* save this for later...


=========================  TASK: normalize a sound


* see slides first...

> s = new Sound( "/Users/wallingf/Desktop/gettysburg10.wav" );
> s.maximumAbsoluteValue()
11312
> s.explore()

* a little helpful output might help us...

> s = new Sound( "/Users/wallingf/Desktop/gettysburg10.wav" );
> s.maximumAbsoluteValue()
Index: 10 value: 61
Index: 15 value: 73
Index: 16 value: 76
Index: 65 value: 83
Index: 66 value: 86
...
Index: 12754 value: 10276
Index: 12755 value: 10364
Index: 12756 value: 10462
Index: 12913 value: 10884
Index: 12914 value: 11312
11312
> s.explore()

* then take the helper print statements out!?

> s = new Sound( "/Users/wallingf/Desktop/gettysburg10.wav" );
> s.normalize();
> s.explore();

> s.maximumAbsoluteValue()
32767