Tivo is a recorder, it puts out only what you put in, if you can record with line doubling or whatever, thats what you get during play back no options.
Do you lose enhancements if using TiVo?
Say your HDTV set or tuner has line doubling and the other tricks. You use good old TiVo to record off standard cable). When you play back a TiVo recording through a set with line doubling and pixel doubling and whatever else, do you get the enhanced picture or basic TiVo output?