// Works on NT, 2k, XP, Win9x with SAPI SDK
// reference & Further examples: See links below!

uses Comobj;

procedure TForm1.Button1Click(Sender: TObject);
var
voice: OLEVariant;
begin
voice := CreateOLEObject('SAPI.SpVoice');
voice.Speak('Hello World!', 0);
end;