Two other thoughts. First, with the Insignia brand digital converter box I bought there is a choice during the Set Up program, under Options, to choose Mono or Stereo. I had to choose Mono, since the connection from the digital box to the tv was just one jack. I would only have chosen Stereo, if the connection to the tv, from the digital box, had the right audio, left audio and video input connectors used. My tv only had one tv connector for connecting from the digital box (previously for the antenna connection), so Mono was the correct choice.
Also, one does have to use the remote, that the digital box comes with, to shut the digital box off, even after the tv is turned off with the tv's original remote. If one leaves the digital box "on," it get fairly warm. No good.