I don't have Euclidean Circles - did it have jumpers that you removed to plug the expander in?? and you haven't replaced them - just a thought - otherwise I'd contact the manufacturer!
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities