You have probably seen this next video already somewhere on the web, but i thought it was a good idea to post it here too... just in case you missed it.
Video: A Short Guide to Sound Synthesis
" A brief guide to sound synthesis / how synthesisers (synthesizers) work. Using a Doepfer A-100 modular synthesiser, I demonstrate CV pitch and gate signals, oscillators, attenuators, mixers, ADSR envelope generators and filters."
Uploaded by Zoë Blade, check out her YouTube channel for more analogue modular videos,
and follow her on Twitter at https://twitter.com/zoeblade