Check the listing for details. AlphaTheta DDJ-GRV6 4-channel DJ Controller with Groove Circuit. Condition: New. Listed at 829.00 USD. Reimagine Rhythm with On-the-fly Remixes and Designer Drums AlphaTheta designed the DDJ-GRV6 to merge cutting-edge creative control with club-standard interfacing. This 4-channel DJ controller inherits its intuitive yet detailed layout from the titan of stage-blazing setups: Pioneer’s CDJ-3000 and DJM-A9 turntable-mixer combo. The DDJ-GRV6 isn’t merely an all-in-one iteration of the Pioneer powerhouse, however, as this unit is as much an instrument unto itself as it is a menagerie of mixing magic, primarily due to one electrifying, game-changing feature: the Groove Circuit. Custom drums and rhythms can be instantly and effortlessly swapped, dropped, and rebuilt, giving you access to on-the-fly remixes and unrivaled rhythmic design.