I am thinking of buying this remote. Dumb question - the logitech website says that it (and other models) can control stereo receivers. Can they also control surround receiver functions, e.g. switching to DTS:ES, etc.? Do these have to be taught or is there a list of surround receivers from which you can select yours to download? Also, is there a cheaper Harmony model that'll be sufficient to control these components: 1. Toshiba rear-proj tv (50H81) 2. Onkyo 502 receiver 3. Directv HR-10 TIVO receiver Thank you for your input.