Pressing the * button allows you to cycle through the various stretch modes and the STB will remember the mode separately for SD and HD channels, however, these days with most people watching mostly HD, I recommend leaving both at "normal" for the best picture quality and no distortion.
To add to the confusion, tv's have their own aspect ratio controls, independent of the receivers. Preferring to see the whole picture, unstretched, I keep both sets of controls 'normal'. The picture is smaller, but I see it all, the way it should look, adjusting for individual shows and films on a case by case basis.
Just because the show has HD on the title in guide doesn't mean it's HD either. 95% of the time that is correct, but there have been instances where Hell's Kitchen or The Amazing Race has shown in Bell's guide as "HD - The Amazing Race". The only thing HD on the Race is the odd commercial, not the show itself, although that's changing.
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