Tubes are HOT! Pulse Oscillator 

 from this page : http://users.triera.net/zupanbra/elektronke/Generator_pravokotnega_signala.html

Automatic Gain circuit from Joe Paradiso's modular

taken from 1978 issue of Polyphony magazine

Low Distortion audio oscillator ,more on the page : http://www.williamsonic.com/AudioOsc/index.html

 

 

 

- No drums were harmed during the making of this song .

Yoyo Oscillator ,the whole article about and the design is shared on this link : http://physics.mercer.edu/petepag/yoyo.html