[Peter Groom]

Youll always get this sort of spill with 2 mics close together.
You should be able to lessen the audible off mi sound in the mix
Peter

Post Production Dubbing Mixer

[Peter Groom]

if youre using 3 DSLR then Ill presume you have 3 camera operator, in which case your problem disappeared as youll also have a sound recordist???!!!
If not Id suggest youre placing waay more importance on the pictures than the audio?
Peter

Post Production Dubbing Mixer

[Peter Groom]

what kind or reality? Thats a wide brief.
Peter

Post Production Dubbing Mixer

[Peter Groom]

have a look at NUGENs VisLM and lc

Post Production Dubbing Mixer

[Peter Groom]

Noise fuel has loads of that sort of thing
https://www.stockmusic.net/index.cfm/page/main.libraryDetails/libraryId/30
Peter

Post Production Dubbing Mixer

[Peter Groom]

Thats good, though like I dont do drugs, I dont do unbalanced easily either.LOL
Peter

Post Production Dubbing Mixer

[Peter Groom]

Im not feeling this?
If youve a zoom, record the audio of both G3s to that on 2 x XLR inputs. Make it all good, with the meters and the monitoring thats the zoom has.
Then use the onboard mic recording of the gopros to provide the sync audio and sync it in the edit.
I have never heard a go pro recording sound anything other than xxx.
Although I was asked by a director tomake a full studio recording sound like a camcorder on a bad day, so i wacked it through a go pro and then back onto the timeline. NOT THAT BAD he said!!!!!
Peter

Post Production Dubbing Mixer

[Peter Groom]

Are you using automation?
Peter

Post Production Dubbing Mixer

[Peter Groom]

You should read more about what levelator does, and how it does it. It isnt justa normalizer. Every software does that. Its cleverer than just that.

You didnt mention about mp3’s. If level doesnt accept mp3 give it what it does recognise.
Peter

Post Production Dubbing Mixer

[Peter Groom]

I think youre looking for Levelator
Peter

Post Production Dubbing Mixer