/**
  * <summary>
  *   Makes the buzzer volume change over a period of time, frequency  stays untouched.
  * <para>
  * </para>
  * </summary>
  * <param name="volume">
  *   volume to reach in %
  * </param>
  * <param name="duration">
  *   change duration in milliseconds
  * </param>
  * <returns>
  *   <c>0</c> if the call succeeds.
  * </returns>
  * <para>
  *   On failure, throws an exception or returns a negative error code.
  * </para>
  */
 public virtual int volumeMove(int volume, int duration)
 {
     if (_func == null)
     {
         throw new YoctoApiProxyException("No Buzzer connected");
     }
     return(_func.volumeMove(volume, duration));
 }