Square = function(audiolet, frequency) {
    AudioletNode.call(this, audiolet, 1, 1);
    this.frequency = new AudioletParameter(this, 0, frequency || 440);
    this.phase = 0;
}
Square wave oscillator

**Inputs**

- Frequency

**Outputs**

- Square wave

**Parameters**

- frequency The frequency of the oscillator.  Linked to input 0.

@constructor
@extends AudioletNode
@param {Audiolet} audiolet The audiolet object.
@param {Number} [frequency=440] Initial frequency.