Altech UEC PVR6690 - Manual (Page 29)

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channel.
6. Audio Control
 When watching a program, press the
[AUDIO] key to display a dialog box
[Audio CTL]. Here you can select to mix
stereo audio to mono so you can connect
your audio output to one RCA
connnector

MULTI AUDIO,
While watching a program you can
select between MPEG2 and (AC3) audio,
press the key [OK] to confirm.