...enable and disable system beep?

// Disable System beep:

procedure TForm1.Button1Click(Sender: TObject);
begin
  SystemParametersInfo(SPI_SETBEEP, 0, nil, SPIF_SENDWININICHANGE);
end;

// Enable System beep:

procedure TForm1.Button2Click(Sender: TObject);
begin
  SystemParametersInfo(SPI_SETBEEP, 1, nil, SPIF_SENDWININICHANGE);
end;

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