uses
  Gorilla.Audio.FMOD,
  Gorilla.Audio.FMOD.Sound,
  Gorilla.Audio.FMOD.Lib.Common;

procedure TForm1.FormShow(Sender: TObject);
var LSound : IGorillaFMODSound;
begin
  {...}
  LSound := LFMOD.LoadSoundFromFile('drumloop.wav');
  LSound.Mode := FMOD_LOOP_NORMAL; 
end;