Sony DCR-TRV50 Operating Instructions (primary manual) - Page 106

Audio dubbing 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 MIC (PLUG IN POWER) : Signal flow Microphone (optional) 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 Intelligent accessory shoe Microphone (optional) 106