auto loop & loop roll pre-determined length from controller.

I am researching new controllers like the reloop Beatpad 2 and the new Mixon 4. When talking about loop length tied to each of the 8 pads the manuals just say things like “The loop size is fixed to a pre-determined length.” but never tells you the length. Seems like this would be a function of the Day Pro software and not the reloop controller. Is it user configurable? Or is it hard coded to 8 pre selected values that I cannot change. For me 16/1 is more valuable than 1/32.