It all begins with sound. OASYS delivers a level of realism, fidelity and sound quality that is a new milestone for a professional musical instrument. OASYS contains three complete synthesis engine algorithms for your audio palette: the HD-1 High Definition PCM synth plus two EXi Expansion Instruments - the AL-1 Analog Modeling Synth and the CX-3 Modeled Tonewheel Organ.