Planet Technology DVR-860 - Manual (Page 27)

BASIC OPERATION
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AUDIO 1 (L) -- audio channel 1, live audio / AUDIO 1 (P) -- audio channel 1, playback audio
AUDIO 2 (L) -- audio channel 2, live audio / AUDIO 2 (P) -- audio channel 2, playback audio
AUDIO 3 (L) -- audio channel 3, live audio / AUDIO 3 (P) -- audio channel 3, playback audio
AUDIO 4 (L) -- audio channel 4, live audio / AUDIO 4 (P) -- audio channel 4, playback audio