Audiovox MMH56 - Manual (Page 14)

4) AUDIO
During playback press ‘AUDIO’ to select the audio language you
desire*, with the current Audio Channel Number (1) and the total
number of Audio Channels (2) displayed. Press AUDIO again to
select another audio language. The audio display will disappear
automatically if the ‘AUDIO’ button is not pressed again for 3
seconds.
5) ZOOM
During playback press ‘ZOOM’ to enlarge the picture by 1.5, 2,
or 4X with the current zoom multiple (1) displaying. Press ‘UP/
DOWN/LEFT/RIGHT’ to move the picture. Press ‘ZOOM’ again
to select another zoom multiple or until ZOOM OFF is displayed
and the picture will return to normal size. The zoom display will
disappear automatically if the ‘ZOOM’ button is not pressed within
3 seconds.
Audio Language Screen Display
ZOOM Screen Display
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*Some DVDs only allow access to this function through the DVD menu.