Sony DCR-TRV39 - Manual (Page 112)

Play button Plays from the current position of the play position slider.
Pause button Pauses playback.
Time display
Displays the currently accumulated playing time of the movie or
sound file being previewed.
Volume control Drag the slider to control volume.
Preview mode
Click the [Preview Mode] button.
Monitor
Click the [Play] button to preview the media stream currently
being edited.