Pixela Corporation DCR-TRV340 PIXELA ImageMixer 1.0 Instruction Manual page 41

Sound is not recorded from the starting point (sound begins late).
Although recording commences when the [Record] button is clicked, sound is not
always recorded from this point. This is because there may be a time lag before
play begins. It is therefore recommended that you set the point at which to begin
recording slightly before the point from which you wish to record. Unnecessary
portions can be cut in the Movie Editing Environment.
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