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Why are my Input Routing Settings for external Sources disabled? I try to connect via line in channel D put cant get audio while using Traktor. Iam using the S4 MK3 Controller :
![Amazon.com: Native Instruments Traktor Kontrol S4 Mk3 DJ Controller, 21.34 x 13.35 x 2.38 inches : Musical Instruments Amazon.com: Native Instruments Traktor Kontrol S4 Mk3 DJ Controller, 21.34 x 13.35 x 2.38 inches : Musical Instruments](https://m.media-amazon.com/images/I/81dpki9wkcL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Native Instruments Traktor Kontrol S4 Mk3 DJ Controller, 21.34 x 13.35 x 2.38 inches : Musical Instruments
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