Hi There š 
Been using my S4 for a good few years and the other day I whet to it and now its only 50% working.
I can pay and stop tracks on both sides but evething mixer side now does not work or register with my Mac. 
There is also no main out to my speakers. 
I have done all the updates to controller, traktor and mac. 
I have tried different usb cable and checked output routing 
Any help would be greatly appreciated 
Thanks