What is the best online resource to learn about modular synthesis?

[smithline]

Does anyone have any recommendations on good resources to learn about the Moog Model 15? I have the iPhone app, but any good resources would do.

[beleca]

That guy Venus Theory on YT occasionally covers stuff like this

[Winstontaneous]

Not apps or video but I've kept coming back to:
- Rob Hordijk's Nord Modular Tutorial
- Allen Strange's Buchla Music Easel manual
- The Arp 2600 manual

Yes, they are product-specific but contain principles & recipes that can easily be applied to other environments by a smart person.