Sorry, realise this was foggy – tremendously hard to explain. So. Space on Thru just receiving clock, everything syncs correctly, though obviously can’t do the program changes I want.
Space on merge receiving clock from ableton and attempting to do program changes prompted by the Space too, doesn’t work. Can confirm that midiclock out is turned off as it should be.
Space on XMT sending clock and PGM changes works perfectly.
Space on Thru with ableton sending clock and pgm changes, the pgm changes work, but the clocks won’t sync and go crazy as per the video. Again, all the peripheral settings like midiclock out etc as they should be.