volumen en windows

[SataSoft]

gracias!!!
ahora.
Alguien a usado esto para pantalla completa.
uso este codigo pero no me sale...

 procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);

begin

if (HiWord(GetKeyState(VK_MENU)) <> 0) and (Key = 13) then
begin
if Form1.WindowState = WsNormal then
begin
Ancho := Form1.Width;//inicialmente tenia errores Con 'Ancho'
Alto := Form1.Height; //inicialmente tenia errores Con 'Alto'
Label1.Visible := False;
Label2.Visible := False;
Label3.Visible := False;
Label4.Visible := False;
MediaPlayer1.Visible := False;
BitBtn1.Visible := False;
StatusBar1.Visible := False;
ScrollBar1.Visible := False;
OleContainer1.Visible := False;
Form1.BorderStyle := BsNone;
Form1.WindowState := WsMaximized;
MediaPlayer1.Display := Form1;
MediaPlayer1.DisplayRect := rect(0,0,Form1.Clientwidth,Form1.ClientHeight);
end
else
begin
Form1.WindowState := WsNormal;
Form1.Width := Ancho;
Form1.Height := Alto;
Form1.Position := PoScreenCenter;
Label1.Visible := True;
Label2.Visible := True;
Label3.Visible := True;
Label4.Visible := True;
MediaPlayer1.Visible := True;
BitBtn1.Visible := True;
StatusBar1.Visible := True;
ScrollBar1.Visible := True;
OleContainer1.Visible := True;
Form1.BorderStyle := BsSingle;
MediaPlayer1.Display := OleContainer1;
MediaPlayer1.DisplayRect := rect(0,0,Form1.Clientwidth,Form1.ClientHeight);
end;
end;
end;
Gracias