Sony Handycam DCR-SR68 Operating Manual page 50

When the screen size of display devices (TV,

etc.) is 4:3, touch
others]  [OUTPUT SETTINGS] (under
[GENERAL SET] category)  [TV TYPE] 
[4:3]  
When you connect a monaural device, connect

the yellow plug of the A/V connecting cable
to the video input jack, and the white (left
channel) or the red (right channel) plug to the
audio input jack on the device.
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