bundan önce 2 tane button oluşturun
unit Unit100;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, MMSystem, StdCtrls;

type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Button3: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
const
deger:Integer=0;
begin
mcisendstring('Set cdaudio door open',nil,deger,handle);
end;

procedure TForm1.Button2Click(Sender: TObject);
const
deger:Integer=0;
begin
mciSendString('set cdaudio door closed',nil,deger,handle);
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
form1.Close;
end;

end.

verildi kardeşim