dacWavPlay()

         Plays a file with WAV format by a parallel DAC

    Syntax:

         dacWavPlay( cFile [, nRate] ) -> lError

         cFile : The name of the file WAV
         nRate : The frequency ratio. Default value is 12000 Hz.
                 Use this value for frequency changes.

    Description:

          Plays a file with WAV format by a parallel DAC.

    Return:

         A logic value indicating if the function finished with error

    Example:

         dacWavPlay( "Luna.Wav", 13224 )