If you have digital cable, you'll still need your cable box, and will have to feed it into the audio/video inputs on the dual tuner TiVo.
Otherwise, the TiVo will only be able to get whatever analog channels are on your cable system, using the TiVo's own cable-ready tuner.
If you have only analog cable, but have any pay channels, you'll still need to use the cable box to get those. The TiVo won't be able to descramble it/them.
No sidewalks with beef, please.