Here is an excellent page with excellent schematics and examples for basic CMOS sound modelling:
sea moss

So go get yourself some ICs, Elkos, resistors and a breadboard and go crazy with your first DIY-synth. I´m right now experimenting with a 40106. But actually he does strange things, that he is not supposed to do. Trying to get bhind that mistery. More to follw soon on this topic.