Many thanks Lugia! Appreciate the help as my new case arrives this week and I want to build it right. Put the two VCOs and filters up top row and bottom row the mixer, quad VCA and quad envelope (Intellijel Quadrax) and leave space in left for more sound sources.

one or 2 maybe - remember they need supporting modules too!!

Do VCAs count as sound sources or control sources?
-- sacguy71

VCAs are neither sound sources or control sources they are sound and control processors/modifiers

"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