did you figure out the isrc for youtube videos  issue?
no. if anyone has heard of DDEX, or understands it, or works for a record label in some capacity dealing with the ddex feed on youtube, i would love to talk to you via email (billwurtz at billwurtz dot com) if possible. i've already read all the google support documents, but i think i need to talk to someone who actually does this professionally and has experience with it .... it's an elusive mindfuck and no one i know has ever heard of it