I've read through the posts and I'm still unsure of the 722 dvr capabilities. Is it possible to record off tv1 while watching another channel on same tv1? I have only 1 HD tv in family room that would be used for the 722. Prefer to watch that HD tv and record another channel at same time. Have 322 in bedroom that also tunes basement tv, both old SD tvs. As I'm really leery of the installers knowledge (past experience) would you guys give me your reccomendation for the preferable setup?