It’s pretty simple what goes on there. MX chain is use on track one. Search here.
I am using scenes to change the start point of a MX chain in order to change a loop. Same with crossfader.
For when beat repeat, this never happened to me that it would stop recording. Repeater sounds the same to me in any case ext or int. I have tape set to on in delay setup menu. Sampler track stopped recording when i had some modulation set on pitch of sampler track. But still then you could sacrifice a track and resample the resampled sample on that track and so on… you would end up with mayhem of Octamadness. 
