BaseAudioContext.createConstantSource()
  The createConstantSource()
  property of the BaseAudioContext interface creates a
  ConstantSourceNode object, which is an audio source that continuously
  outputs a monaural (one-channel) sound signal whose samples all have the same
  value.
    Note: The ConstantSourceNode()
    constructor is the recommended way to create a ConstantSourceNode; see
    Creating an AudioNode.
  
Syntax
var constantSourceNode = AudioContext.createConstantSource()
Parameters
None.
Returns
A ConstantSourceNode instance.
Specifications
| Specification | 
|---|
| Web Audio API  # dom-baseaudiocontext-createconstantsource  | 
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