When trying to connect my two Technics turntables in scratch control mode, it is still calculating, what should I do?
Are you on Mac OS? In that case make sure you gave Traktor access to the microphone.
https://support.native-instruments.com/hc/en-us/articles/360000471958-macOS-Dialog-App-Name-would-like-to-access-the-microphone
If on Windows or you already did that, please share a screenshot if you input routing. Preferred while playing a timecode vinyl