Hey,
Well to start off, you gotta have your vocalists/musicians sing/play along with the original soundtrack. Yeah I mean get some kind of a stereo playing while you’re filming, and have them sing along! Obviously practice a lot to get it down good, all the pauses, breaks, etc…Also actually have them sing/play while filming not just move their lips or whatever, because at the end you just sync the audio from the video, mute it, and that’s the best as it gets as far as syncing goes. If you got this method nailed down, you’re pretty much all set to go with the instruments, etc… as well.
Good Luck.
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