 Unlike the Alesis Andromeda, Alesis's analog synthesizer, its sounds are synthesized using DSP chips to mimic the sound of analog audio circuitry and components.The Ion has several features that make it stand apart from other analog modeling synthesizers.Most importantly, it features a selection of emulations of classic analog filter models of synthesizers such as the Moog Minimoog, Oberheim's SEM, the Roland TB-303, the ARP 2600 and the Roland Jupiter 8.