Thanks for the reply. Yes I know SYSEX works 100% as I've been sending a whole load of other messages to it, I've mapped at least 45 faders on an external controller to different messages for the AN200!
So that's why it's extra frustrating that this sequencer play mode I'm trying to explore doesn't work - it would be 1 of the best features imho.
1 possibility is that this feature doesn't exist and was just borrowed from AN1X SYSEX data and was never proof-read before being published :-(