Looking into this further, I don’t think it’s possible to use an S4 (or any Traktor controller) w/ Traktor and setup a send/return loop. Everything I’m reading is about sending an external device through Traktor’s internal effects.

To do what you’re looking to do, you would need to be using a DJ mixer, either with Traktor integration (or built-in sound card), and external third party controllers. There’s just no way that I can see to configure the FX section to send track audio to the external send/return bus. The UI doesn’t allow this.

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