21-can-the-nhs-fix-a-broken-piano

We got most of the code for a piano interface (sort of)
http://jsbin.com/luhin/1/edit

But some keys are missing. Can you complete all the other keys?

We are using the function constructor to create multiple instances that are similar objects.

For instance, A can be described as:

var A = {
freq: 440,
      type: 0,

      play: function() {
        if (this.oscillator) this.stop();
        this.oscillator = context.createOscillator();
        this.oscillator.connect(context.destination);
        this.oscillator.frequency.value = this.freq;
        this.oscillator.noteOn(0);
      },
stop: function() {
        if (this.oscillator) {
          this.oscillator.disconnect(0);
          this.oscillator = null;if}
      }
};