I get this as a digest so pardon if I missed a post where somebody
already mentioned it, but one solution is here:
https://sixteenmillimeter.com/projects/SoundtrackOptical/
One of the many gifts that Matt McWilliams has given the world is a
software library for generating soundtracks. It's not an off-the-shelf
solution but it may get you most of the way toward a digitally-generated
optical track!
-Zach Poff
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