USB Midified Behringer VMX200 for Traktor
Use the MIDIUSB from arduino-libraries with an Arduino Due.
https://github.com/arduino-libraries/MIDIUSB
Cut all control's and Leds PCB traces from a Behringer VMX200. Connect it to an Arduino DUE or Arduino with atmega32u4 or ARM microcontroller.
Keep the MB89193A and 74HC373/74HC273 to display BPM and Vu Meter.