@trabant - at that point in time, it looks like echo freeze delay with the Delay Control trig mode (p 94 of ye olde manual)
also see here:
http://elektron-users.com/index.php?option=com_fireboard&Itemid=28&func=view&catid=9&id=129619
I actually had typed out the text that veets put in his video that Accent included above. I found that very helpful.
- In Delay Setup, set Lock=ON and Pass=OFF
- Scene A: Delay Send = 127, Feedback = 127
- Scene B: Lock Delay Send to 0
- Set Delay Time to 64, 32, or something similar
Then you can control this from Delay Control Trig Mode to beat repeat on one or more tracks.