I have used Serial on my cable box for one of my S2's since I've had it. Used analog for the other two that I had at the time. Now, since Charter has moved to full digtial, it has made me put another box in the mix. Background...A few years ago, I started having problems with some of the channels(mostley channels over 100,but not all) where if you would change to channel lets say, 500, the cable box would change to 500, then to 501, 502 until it would finally stop on a channel it liked. I did receive all those channels but for some reason the communication from Tivo to cable box just didn't work. At the time, I tried to switch over to IR. That actually made things worse. If it would try and change to 54, I may get 5 or 4 or something other than 54. I did try and build a wall around the IR like was suggested at the time, but finally gave up and went back to serial. Now, today, neither really is not working very well. This is with the new Charter switchover and new channel lineup. Serial is now working like the IR use to. Sometimes it works, and now sometimes it doesn't. For example, I tried to record a hockey game on MSNBC this morning at 3:30am. It was on channel 54. I got up to find I recorded channel 4. This is with serial. I have set up my other S2 with IR to see how it would work, and really it works the same way it always had, not very reliable. I seem now to not trust any way to change channels on either S2's. Any suggestions on how I can fix this????