User`s guide

Chapter 3 Menus and Settings
Sound - ATSC
AC3 - ATSC
Aspect Ratio: Click to select the width to height ratio for your Presto! PVR
screen. You can choose Original Ratio (4:3), Free Ratio or 16:9.
Choosing Free Ratio will allow you to distort your TV picture by dragging
the lower-right corner of the screen. If you have chosen Original Ratio
(4:3), the ratio will not change as you resize the picture.
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