/**
  * <summary>
  *   Immediately play a note sequence.
  * <para>
  *   Notes are provided as text words, separated by
  *   spaces. The pitch is specified using the usual letter from A to G. The duration is
  *   specified as the divisor of a whole note: 4 for a fourth, 8 for an eight note, etc.
  *   Some modifiers are supported: <c>#</c> and <c>b</c> to alter a note pitch,
  *   <c>'</c> and <c>,</c> to move to the upper/lower octave, <c>.</c> to enlarge
  *   the note duration.
  * </para>
  * </summary>
  * <param name="notes">
  *   notes to be played, as a text string.
  * </param>
  * <returns>
  *   <c>0</c> if the call succeeds.
  *   On failure, throws an exception or returns a negative error code.
  * </returns>
  */
 public virtual int playNotes(string notes)
 {
     if (_func == null)
     {
         throw new YoctoApiProxyException("No Buzzer connected");
     }
     return(_func.playNotes(notes));
 }