Roland JD-XA Is a phenomenal Hybrid Synthesizer, combining the best features from both Analog and Digital Synthesizer Circuits. It features 49, Velocity Sensitive Keys that run with Channel after touch to be able to run patches seamlessly from one to the other. The four separate Analog synthesizer circuits allow for seamless integration between patches or running multiple at once. The Digital Synthesizer circuits feature Roland's 'SuperNATURAL' technology to allow massive ranges of velocity and polyphony across a full range of 64 voices. The Synthesizer also features a powerful 16-track pattern sequencer with 8 tracks for internal parts and a further 8 for external sources. The system also integrates a powerful Mic-Controlled modulation system, as well as using the synthesizers built in effects such as reverb and compression directly onto your vocals and have it send out on an external output. The Powerful on-board Drum Section w/ PCM allows for an extremely high quality Drum Production on the system. The 8 simultaneous on-board effects can be applied to any section of the synthesizer as well as any of the audio inputs itself. The 67 Different types of effects such as Reverb, Delay, Effects and Modulations found in this Effects suite are incredibly flexible and high quality. It also features a Built-In Arpeggiator and an LCD Display. This features high quality hardware too, with a Pitch Bend and Modulation Lever and Wheel as well as as most of the Modulations being directly available without having to reach for submenus.