How Walter Murch Merged “Apocalypse Now” and “Ride of the Valkyries”
nautil.us
nautil.us
If only we could hear both edits and compare.
It's virtually impossible to be quantitative about any of that, of course.
There's fMRI research being done on synesthesia [1], but I'm unaware of any studies that go into the exact correlation between specific colors and specific timbres.
[1] http://ist.ksc.kwansei.ac.jp/~nagata/nagata_lab_folder/nagat...
Since the film editor isn't a brain scientist, I presume he's using the term synesthesia quite broadly to describe these sort of sensory interplays that are apparent to him but have barely been explored by researchers.