Altech UEC PVR6600 - Manual (Page 28)

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TV/ RADIO CHANNEL
Press the [OK] or [LIST] key to list channel
Press the UP/DOWN key to highlight
[TV/Radio Channel], press the key [OK] to
change.
The Up/down arrow key also changes the
channel.
4. 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.