SuperNATURAL ARX Expansion Fantom-G provides ARX slots that accommodate two SuperNATURAL expansion boards. SuperNATURAL is Roland’s unique behavior-modeling technology that enables a new level of organic, emotional expression previously unattainable in synthesizers. Applied to traditional-instrument sounds, SuperNATURAL enables the delicate, organic tonal changes and playing nuances of real musical instruments. It’s also a powerful tool