The manual entry "Audio Offset," which was taken from Adam's manual, "Secrets of Cinelerra," provides an excellent method for synchronizing a video track with an audio track. It has been a long time since I read it and I want to bring it to your attention again: https://cinelerra-gg.org/download/CinelerraGG_Manual/Audio_Out_section.html There is also a video tutorial by Adam: https://www.youtube.com/watch?v=n0evGSOpwbY&list=PLv6Mn7I6pSmWivUKTvf_CzqHjn...