I think you've got enough sound sources - light on utilities though - this is where I'd add - they will vastly increase versatility

logic, attenuators, mixers (sub and matrix), switches, more vcas etc etc etc

I would only add another sound source to this if I was adding more rows

see my signature for some hints

"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