Idk.i have literature on the 1128x.it looks like it was more a master/ slave more x units together,control with one 1128.
Had I seen this 2228 back in the day,I would've been all over that.
Nope, never saw that in any studio back in the 80s. I too woulda jumped on these if I had seen one in the wild. "Oooo!! What's that? Show me what it does." I was always super curious about rack gear back then.