///var empty = new Sound();
empty
[object Sound]
empty.toString();
[object Sound]
empty.valueOf();
[object Sound]
Object.prototype.toString.apply(empty);
[object Sound]
Object.prototype.valueOf.apply(empty);
[object Sound]
///var silence = new Silence();
silence
[object Silence]
silence.toString();
[object Silence]
silence.valueOf();
[object Silence]
Object.prototype.toString.apply(silence);
[object Silence]
Object.prototype.valueOf.apply(silence);
[object Silence]
///var noise = new Noise();
noise
[object Noise]
noise.toString();
[object Noise]
noise.valueOf();
[object Noise]
Object.prototype.toString.apply(noise);
[object Noise]
Object.prototype.valueOf.apply(noise);
[object Noise]
