If you enjoy this sort of low-tech, lo-fi electro music, get a copy of Nicolas Collins’s Handmade Electronic Music, which is full of projects and great ideas for ways to tune up and freak out.
This design—much like the effects earlier in this section—owes a great deal to the cornucopia of effects and musical instruments T. Escobedo shared on his FolkUrban website (including his synthstick, which uses a very cool and easy homemade ribbon controller). Sadly, Escobedo’s site is no longer online, but I’ve archived some of his projects on this book’s website: http://www.davideriknelson.com/sbsb/.