Sony ICD-B25 - Manual (Page 13)

Basic Operations
13 GB
Various Ways of Recording
Starting recording automatically in response to the sound
— Advanced VOR function
When the VOR (voice operated recording) function is set to ON (page 36),
recording starts when the recorder detects sound and stops when no
sound is heard.
Note
VOR function is affected by the sound around you. Set the microphone
sensitivity (SENS) to either H (high) or L (low) (see page 36). If recording is not
satisfactory after you have changed the microphone sensitivity, or for important
recording, set VOR to OFF.
Recording with an external microphone or from other
equipment
Connect a plug-in-power type microphone or other equipment to the MIC
(PLUG IN POWER) jack.
When you connect an external microphone, the built-in microphone is
automatically cut off. When a plug-in-power type microphone is
connected, power is automatically supplied to the microphone from the IC
recorder.
Adding a recording
To add a recording to a previously recorded message or to add an
overwrite recording during playback, see pages 21 and 22.