Is connecting Korg kaoss Pad Quad to Rane One Controller possible?

Hey guys, a bud of mine would like to use this Pad with his controller. Problem we are facing is the controller's audio input is usb, he has tried connecting from the controller's OUT to his speakers but that doesn't work. Seems this Kaoss pad only works when the source signal is running directly through it.

I am wondering if maybe adding a DJ Mixer or Mixing board to the equipment might allow for this to be possible with any configuration please? He's running Mackbook ->Rane One->Powered speakers. these the screenshots of what's involved:

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