Pioneer DJ AlphaTheta DDJ-GRV6 4-Channel Performance DJ Controller (Matte Black)Pioneer DJ AlphaTheta DDJ GRV6 4 Channel DJ Controller with Groove Circuit Function (Matte Black) Groove Circuit Function With the Groove Circuit function, you can easily create remixes by simply pressing the dedicated buttons. This enables you to replace the drum parts of a track even while its playing with different drum loops, changing them into different genres and performing unique remixes effortlessly. And, by applying effects to the drum parts,