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I see you've been a member here for almost 2 years.. I'm sure you've picked up on a few kernels of knowledge here and there, as well as an idea of the "progression of effects-DIY knowledge", I'll call it:
reading < building/mimicking < troubleshooting < tweaking < designing
First you have to learn to read a schematic, read a vero/stripboard layout, read a datasheet. From there you can look at a vero layout and attempt to build it up, skipping the breadboard stage if you're feeling ballsy or impatient or confident. Reading a vero layout, buying the components you need, and putting together a pedal doesn't really require knowledge of "how to use CMOS devices"... or really "how" do to anything. Digging deeper into a circuit/schematic/layout requires knowledge of components and how they work, and moreso how they interact with each other depending on the flow of causation through the circuit. At this stage you're more likely to successfully troubleshoot, and especially more likely to successfully mod a circuit to your liking.
The ideal place to be on the P.O.E.DIY.K (lol) is the final stage. Designing a circuit from scratch requires passage through all previous stages, with the additional step of truly understanding both the circuit as a whole (globally) AND how each individual component within the circuit is experiencing it's place in the circuit (individually).
So to more directly answer your questions:
1) "where can I find... how to build a VCA, VCO, ... and all the other stuff" ----- you really only need to be at the second stage in the chain above to do this. There are vero layouts of some of these circuits on this very site. If you can't find what you're looking for here, electromusic has a bunch of synth- based layouts, as well as Muffwiggler and a handful of other sites.
2) "how to use 4015, 4046, ... and other ICs, and how to convert my guitar signal" ---- this requires reading, and lots of it - Datasheets, textbooks, build documents, schematics... everything you can get your hands on. Start somewhere and just keep digging, jumping around from resource to resource until you understand what you need to. The References thread on this forum is a great place to start textbook- wise. I posted a link to one of my dropbox folders where I've uploaded a dozen or so classic, must-read books on just this subject. The Lancaster's CMOS or Active Filter cookbooks are great, Anderton's DIY book is considered to be a bible by some, same with Ray Wilson's DIY book.
Unfortunately there really isn't a specific "Turning your guitar into a synth-controller for hyper-dummies" book, but the text in that non-existent book is definitely scattered throughout the internet... across this site, other sites, textbooks in the Resource forum, datasheets, etc.
Best of luck.. this site is a GREAT resource and has taught me so much, through conversation and via recommending me other resources.
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