in the hd settings on the 811 and the 6000 they have something to mark as 16:9, 4:3 1, and 4:3 2. i have the tradional 4:3, about 3 years old, and have the setting as the 4:3 1. can someone explain what these setting acutally do? i understand the 16:9 will be used for widescreen, but what about the other two?