Traktor S4 Mk2 · mixxxdj/mixxx Wiki · GitHub,Just bought used Traktor Kontrol S4 MK2, plug in and these lights turn on, recognised in traktor Pro but yet the decks are unresponsive. Anyone seen this issue before? : r/DJs,REVIEW: NI Traktor Kontrol S4 MK2 DJ Controller – DJWORX,REVIEW: NI Traktor Kontrol S4 MK2 DJ Controller – DJWORX,Native Instruments Kontrol S4 MK2 Digital DJ Controller