process(src, amount, oversample) {
    src.connect(this.input);
    this.set(amount, oversample);
  }
Process a sound source, optionally specify amount and oversample values.

@method process
@for p5.Distortion
@param {Object} src An object that outputs audio
@param {Number} [amount] Unbounded distortion amount.
                               Normal values range from 0-1.
@param {String} [oversample] 'none', '2x', or '4x'.