Sony DCR-TRV140 - Manual (Page 122)

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When you play back a dual sound track tape
When you play back a tape which is dubbed from a dual sound track tape recorded in
the DV system, set HiFi SOUND to the desired mode in the menu settings (p. 108).
Sound from speaker
HiFi Sound Playing back Playing back a dual
Mode a stereo tape sound track tape
STEREO Stereo Main sound and sub sound
1 Lch Main sound
2 Rch Sub sound
You cannot record dual sound programs on your camcorder.
About video cassettes