Pioneer DJ DDJ FLX10 Limited Edition 4-Channel Professional DJ Controller (White)The DDJ FLX10 W is a 4 channel performance DJ controller for rekordbox and Serato DJ Pro. It includes a host of brand new features including STEMS technology, which enables new creative possibilities such as the easy performance of mash ups on the fly with no need to prepare tracks in advance. STEMS for innovative performances including live mashups Load the regular songs from your music library and create remixes and mash ups on the fly by