Getting the noise out of the audio is one issue, but I do have another question for you: This DVR will be put in a unit that is activated by a motion sensor. I want to be able to trigger recording when motion is sensed. The DVR records individual video files in 10 min segments. There are cables attached to ports that would activate 'record', 'playback', etc.. You can see that in the pic above. I'm wondering how that trigger would be activated? I tried to activate it by connecting the signal wire from the motion sensor to the record wire from the DVR, but nothing happened. Maybe this function will require an Arduino or Digispark microcontroller?