yeah, it's convoluted and sounds tricky but it's not. I have same stuff as you probably. DSLR, BMPCC, H4n, Tascam, boom mics,, etc...shoot myself, edit myself. Soooo, lets say you shoot some stuff. and it's a go pro maybe a drone maybe on your head riding a bike, whatever. Now you have AV ( audio and video ). Now you want to record some stuff on H4n and sync it to footage ( the visual part ) of your previous work via go pro... why not use what I suggested, and slate the shot using a visual timecode cue from your timeline of your go pro stuff.... ( and a clapper to make sure you sync the H4n to that code … in other words, that's when you turned on the H4n and started recording )... you throw out the video portion cause you might not need it for your purpose ( I have no clue what you mean by lip sync, but the go pro maybe has some guy talking ? ) … so now you are in sync with the h4n via timecode from your own editing timeline and the clapper for when you started recording on the H4n. Anyway, as you say, there are automatic ways to do this now... because the program can match waveforms and sync that way, so you can just press a button and get it done. Whatever works is the best way.
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