Full 4-Deck control with 4 FX Units. Based on Kassidy v1.20 mapping... provides most of the same functionality plus additional capabilities. Uses "Scratch" buttons to change between decks. Uses "Sampler" buttons to change knobs and buttons between HotCue and FX modes. See attached image for documentation of all available functionality. 

VERY IMPORTANT: There are TWO mapping files to download and import in order to get 4-deck/FX functionality. One mapping file provides the Deck A/B & FX 1/2 control and the other mapping file provides the Deck C/D & FX 3/4 control. Assign both mappings to have the SAME MIDI inputs and outputs (Vestax Spin 2). Import BOTH mapping files before testing the mappings or using the controller. If something does not appear to be working correctly after importing try quitting and reopening Traktor in order to reset the "Modifier State."

Link to Deck A/B & FX 1/2 mapping:

Vestax Spin2 4-Deck/FX for Traktor (Deck A/B & FX1/2) 

https://maps.djtechtools.com/mappings/6572