I just had a Comcast cable box installed. Until then, I was able to record from tv to one vcr deck and at the same time watch a vcr tape on the vcr deck. I was told that I could record from the cable box by using an A/B switch. But, I've tried a few hookup choices with no luck. There are 2 coax cables coming from the cable box. Please tell me exactly how to hook up each cable from the cable box to the vcr and to the tv. Also, will I be able to watch a tape on the other deck while I'm recording on the other deck now? Any help will be most appreciated. Thank you.