Altera Enigma is the Jazz Fusion influenced Progressive Metal/Rock band of Jason De Ron (the former guitarist of Paramaecium), and Jefray Arwadi (guitarist and vocalist of Kekal). Both these musicians have a career that has seen them record and released nearly 20 albums between them.

While both Jason and Jeff may be more well known for their metal, with Paramaecium and Kekal having both released many critically acclaimed albums of intense, evocative metal, in actual fact both musicians are heavily influenced by Jazz and Progressive music in all it's forms.

Altera Enigma was formed as an outlet for Jason and Jeff to work together on music that would push their boundaries, challenge them musically and allow them to broaden their horizons and explore progressive music in all it's forms. The addition of Kenny Cheong in 2005, a Jazz Fusion bassist who plays a 5 string fretless, allowed Altera Enigma to further develop their Jazz Fusion influences and develop their signature sound. 2007 saw the addition of Jayson Sherlock on drums.