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.

Altera Enigma utilizes modulating time signatures, rich Jazz-Fusion inspired chord progressions and memorable, emotion driven melodies, and expressive, stunning lead work. Always conscious of melody and utilizing tight, powerful arrangements, their music takes listeners on an aural journey via sophisticated harmony and elaborate, engaging rhythms. These musicians draw on the complexity of instrumental bands like Liquid Tension Experiment and Gordian Knot, the energy of Heavy Metal bands such as Iron Maiden, and then fuse it with the emotion and sophistication of Jazz Fusion to meld their music into a fascinating, emotive, energetic journey via the listeners ears, mind, heart and soul.

Altera Enigma is living proof that Progressive music is still vital, and is waiting to be fully explored. While drawing deeply on the best parts of Progressive Metal and Jazz Fusion, the band pushes the term "Progressive" well into the 21st century and beyond, creating a compelling, modern style which provides listeners with a glimpse into a higher musical realm that is now beginning to be fully explored.