Roland's A-Series Keyboard Controllers offer sensitive real playing feel for both live and studio, whether hooking up to a DAW, virtual instruments or modules, with a full range of pads, keys and sliders to keep even the most discerning producer 'in the flow'. When you perform with the A-800PRO, you’re tapping into the benefits of over 30 years of Roland keyboard development. A superior key mechanism provides aftertouch and and increased sensitivity for a wide range of expressive dynamics in your performance. Rounded key assemblies offer responsive reaction to your touch and more comfortable glissando. Plus, enhancements have been made to eliminate vertical shake and reduce the already low mechanical noise on key strokes. And with selectable Velocity curves you can fine tune the A-800PRO to match your playing style. No matter what your skill level, you’ll appreciate the feel of a quality instrument when you play the A-800PRO. Velocity-sensitive 61 keys with channel aftertouch Inspiring feel and response for serious players 45 assignable controls: knobs, sliders, buttons, transport and more 8 Dynamic Pads for finger drumming and MIDI triggering Sure-grip Pitch Bend/Modulation Stick Expand playability with sustain and expression pedals (available separately) USB Bus Powered — no AC adaptor required (AC adaptor is an optional) Durable Roland-quality manufacturing and craftsmanship Works with any DAW on Mac or PC Supports Windows 7 and Mac OS X Snow Leopard