[BLOK]

YouTube via mutepg58
"[BLOK] Modular

http://www.blokmodular.com - polyphonic vu"
"What is [BLOK]?
[BLOK] is an easy to use modular synthesis environment for VST. The available processing blocks are simple and concise and there are no restrictions on how you hook things up. [BLOK] was designed as a platform for teaching audio synthesis to students, so even beginners can get started building their own synthesizers and effects right away!"