Sony DCR-TRV50 - Manual (Page 106)

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You can record audio to add to the original sound on a tape by connecting audio
equipment or a microphone. If you connect audio equipment, you can add sound to
your recorded tape already recorded in the 12-bit sound mode by specifying the start
and end points. The original sound will not be erased.
Use the Remote Commander for this operation.
Select one of the following connections to add audio.
Connecting the microphone with the MIC jack
You can check recorded picture and sound by connecting your camcorder to a TV with
the A/V connecting cable.
Recorded sound is not output from the speaker. Check the sound by using a TV or
headphones.
Connecting the microphone to the intelligent accessory shoe
Audio dubbing
Microphone (optional)
Intelligent accessory shoe
Microphone (optional)
: Signal flow
MIC
(PLUG IN POWER)