I have a basic comcast cable package and an old analog tv with an older vcr. I was given one box for free through comcast but I love to record my tv shows. However, I would like to watch another channel while recording another at the same time. They told me if I shut off my converter I will get channels 2-29. Please tell me there is another way around this. I have read in order to receive all the channels I get through my converter, to get another converter box? Do I have to go through comcast to get another one? If so, will they allow me to do this?