Okay i have a 612 and Im trying to get ever feature out of it that i can. Ive already got an EHD to add more recording time, and now im thinking about adding OTA to add a third tuner. I know with a 722 you have to have an OTA module to watch OTA shows, but with a 612 is it built in? What steps do you take to add OTA and a third tuner to a 612?