Back in 1970 when I did all of the sound, from
microphone to finished optical print, for a
university film unit with four
producer/directors, I encountered an interesting
technique for lowering the level of a piece of
audio, or even "erasing" an unwanted noise from
16 mm full coat mag film.
One simply took a permanent magnet and brought it
near the mag stock at the appropriate place.
Needles to say it took some practice to learn the
technique and S/N was lowered momentarily. As I
recall the exact movement of the permanent magnet
was of prime importance. Finding the exact spot
was accomplished on a movieola.
>Many years ago, at Jerry Valburn's (Jazz Archives) house John R.T. D. was
>visiting here on Long Island. I was flattered to be invited to witness a
>demo of his 'oxide scraper'. It was a miniature console made out of wood:
>its aesthetic was charmingly 19th century. I DO NOT MEAN THIS FACETIOUSLY
>OR SNIDELY. Perhaps inspired by a 'Moviola', and or film splicer, it
>solved the problem of precisely locating the transient noise.
>This is all from memory. If you think that I've made factual mistakes, then
>let me know and let's discuss