Sony SLV-AV100UX - Manual (Page 73)

73 Advanced VCR Operations
How sound is recorded on a video tape
The unit’s VCR records sound onto two separate tracks. Hi-fi audio is
recorded onto the main track along with the picture. Monaural sound is
recorded onto the normal audio track along the edge of the tape.
Stereo
Usually mixed
left/right channels
Normal audio track
(monaural)
Hi-fi audio track
(main track)
Stereo sound
(left/right channels)
Bilingual
Main (left channel)
Sub (right channel)
Usually main sound