a matrix mixer is always useful, especially for extending modulation - copies of 4 modulation sources in gets 4 related, but more complex modulation signals out... doepfer for ergonomics and economics! although once you have one, you'll probably want a second one... they are so useful

the nin expander for zadar is also potentially useful...

"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