High background audio signal amplitude

My audio signal in channel 1 has still before and after the voice part a relatively high amplitude of background audio signals (movie with voice). How can I improve this and mute these parts? The filtered background audio in channel 6 sounds good and my voice is perfectly removed. Also the 4 directions are only recording my noise. I tried to disable ACG with tuning.py but this was not solving this sufficiently.

Am I right if I assume that the audio signal looped through the audio jack is subtracted and gives better background audio signal removal in comparison to other background audio sources? In my case this does not seem to be the case then.