...use the Microsoft Speech API?

// 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;

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