Sony VPLL-3024 Fixed Short Throw Lens (2.34:1 to 3.19:1) - Manual (Page 67)

Hint
If you use the built-in microphones for recording with the Pre-recording function, noises may be recorded when you press
REC/PAUSE. We recommend that you use an external microphone for recording with the Pre-recording function.
If you stop pre-recording without starting regular recording, the buffered in the recorder's memory during the pre-recording period
will be cleared.
To cancel the Pre-recording function, select [OFF] in step 2.
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