Thu Jan 16, 2020 7:15 pm
Did you choose "Auto Sync based on Waveform" or "Auto Sync based on Waveform and Append Tracks?" If you choose the former, the scratch audio in the video clip is replaced with the synced audio. If you choose the latter, the scratch audio is preserved and the synced audio is appended.
Auto-sync by waveform has worked very reliably for me, including in v. 16.
Resolve 19 Studio, M2 MacBook Air with 24 gigs of RAM; also Mac Pro 3.0 GHz 8-core, 32 gigs RAM, dual AMD D700 GPU.