HRDWRK,
If you look at the diagram on the manual (post #54 above) of the Camera Cable for the RVS-770 Back Up Camera the white plug should be the audio from the "Built in High Gain Microphone". Does your monitor have an audio or microphone jack? If so, you should be able to enable the backup's microphone.
Doc
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Sheree & Michael NCNG LTC(ret) with Munpi, RC and Sheba (cat).
2019 Nexus Viper 27V, E-450, 5 speed "Ms. Enterprise", Infotainment Center, HUD, , Safe-T-Plus, Curt SpareTire Mount, ext. WiFi Antenna, Roadmaster Tow Sys& Invisibrake.
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