TriggerControl = function(audiolet, trigger) {
    AudioletNode.call(this, audiolet, 0, 1);
    this.trigger = new AudioletParameter(this, null, trigger || 0);
}
Simple trigger which allows you to set a single sample to be 1 and then
resets itself.

**Outputs**

- Triggers

**Parameters**

- trigger Set to 1 to fire a trigger.

@constructor
@extends AudioletNode
@param {Audiolet} audiolet The audiolet object.
@param {Number} [trigger=0] The initial trigger state.