1] Walter Ego was a name used by Simon Posford, better known as Hallucinogen and Shpongle, from 1998-2000 for his two tracks on Eclipse: A Journey of Permanence and Impermanence: Dubstuff and Purple Pygmies. 2] A bass music producer. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.