message: Add warning message to OutputToneWithSteppedAmplitude example
diff: Plays a single tone followed by silence. Repeats the tone+silence at increasing amplitude.
  The last tone should definitely distort. The 2nd-to-last tone should be on the edge of distorting.
  + WARNING: DO NOT LISTEN TO THIS WITH HEADPHONES ON
  MIT License, Use at your own risk.
  */
  