Beep

Causes the system to issue an audible tone. You can specify the tone frequency in Hertz, the duration in milliseconds, and the intensity as a value from 0 to 255, with 255 being the loudest. Although this VI appears on all LabVIEW platforms, the frequency, duration, and intensity parameters work on the Macintosh only.

frequency (Hz) is the frequency of the tone in Hertz. This parameter is valid only on Macintosh.
duration (msec) is the duration of the intensity of the tone. This parameter is valid only on Macintosh.
intensity sets the intensity of the tone. This parameter is valid only on Macintosh.
error returns an error.