Bob –
Not to get argumentative and petty about this … although since I am old and grey argumentative and petty comes pretty naturally … but I believe you’ve got your B-mode and C-mode mixed up.
A-mode is an EDL that has to be constructed in event order since underlying sync shots come first and overlaying video-only events come after.
B-mode is a list that is cleaned so that there are no overlaying events – you can assemble it in any order and it will work — but the events are numbered sequentially with the record master – opening shot is event 1, 2nd shot is event 2 till the last shot is reached.
This could be highly inefficient, even if your edit controller could “look ahead” to find all events from a given source tape, because the source tape would have to shuttle all over the place, and if your program tape was shorter than your source reels, as is the case for anything under a half hour show, a different type of sorting that would minimize source reel cueing and let the record master search back and forth could be more efficient – hence C-mode – which numbers the events from the earliest event of the first source reel to the last event of the last source reel.
Ahh, this does bring back memories – not all of them good.;-)
Herb Sevush
Zebra Productions