CopperLan supports hotplugging so I want to use it as a bridge between the USB MIDI hardware and Traktor. I've configured CopperLan as follows (an example):
Launchpad S -> VMIDI 1
VMIDI 1 -> Launchpad S


Then in Traktor I select Input = VMIDI 1, Output = VIMIDI 1. The problem is that Traktor is receiving the input successfully, but the output from Traktor is not reaching the Launchpad S. I've previously used more complex set-ups involving MIDI-OX + loopMIDI and I can't think of anything that's wrong with my configuration.
Thanks!