bas7advr.hlp (Topic list)
SOUND Statement Details
  Syntax  Details  Example                 Contents  Index  Back
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The SOUND statement generates sound through the speaker.
 
SOUND frequency, duration%
    ■ If duration% is 0, any current SOUND statement that is running in
      the background is turned off. If no SOUND statement is running, a
      duration of 0 has no effect.