Spending hours on this kind of thing at the moment. Great chunks of time getting transcribed from video tape, compared, annotated, re-done, rehearsed, edited, tweaked then re-transcribed, annotated and re-done. It can get to feel like you're in Tom McCarthy's Remainder (I wrote about it here). All towards the new Forced Entertainment performance Spectacular which opens this Thursday here in Essen. See the FE site here for more details.