One other VCA point: both Antumbra and After Later that I know of offer something of a "half-Veils"...two variable-topology VCAs in 4 hp with a summing buss that allows you to output them separately or together as a 2-into-1 mix. These can be VERY useful, especially for dropping into little spaces in your modulation complement so that you can futz around with modulation levels. Pair that with some small CV/mod mixer such as Frap's 321 or Tiptop's MISO, and you'll have a VERY powerful "modification core" solely for your LFOs, EGs, slope gens, etc.