A few days ago I finished up that Atari Punk Console I had been working on. The casing is a plastic foodbox. The two red pushbuttons on the front activate a capacitorbank and are a variation on the original design. Pushing them causes a drop in frequency. It makes the APC a litle bit more versatile. I got the idea of adding a capacitorbank from GetLoFi. You can buy kits from them with everything in to get you started. I buy my components seperately from online retailers. Takes a bit more time.
Next is a circuit with 3 oscillators based on a 74C14, as described in the book Handmade Electronic Music by Nicolas Collins. Below is a crooky testdrive with the APC and a buggy breadboard set-up of the 74C14. More decent tracks can be found in my earlier posts (see Cataclysm of a distorted mind and A Happy New Year Release).