I'm completely new to home theatre so I'm riding a bit of a learning curve going on at the moment. I'd always been a bit dubious about the benefits of home theatre before but watching my first few 5.1 movies at home last night was stunning. The effects are so much better than at the cinema due to your near perfect positioning in the sound stage. Anyway, what I'm wondering about is what to use for normal TV transmissions. I've currently got my TV setting as pro-logic II in movie mode. My amp, however also has 'old' pro-logic as a different input. I've done a bit of reading on the Dolby site and elsewhere and it appears pl-II is backwards compatible. What situations might i want to use PL-I for rather than PL-II? Kit: NAD743amp, 513 DVD, Monitor Audio Radius 270LR/225C/90S/360sub.