Sony SLV-SF99EN Operating Instructions Manual page 77

Additional Operations
Note
• After you use this feature, the audio in playback mode is automatically set to monaural.
To listen to both the hi-fi and normal audio
Set AUDIO MIX to ON in the AUDIO OPTIONS menu (see page 72). Use this
feature to listen to dubbed audio over the original hi-fi audio. When AUDIO MIX is
set to ON, the AUDIO MONITOR button does not function. Note that by mixing both
hi-fi and normal audio, some echo may appears.
77
Audio dubbing