In VDJ, these can be re-mapped to trigger "Slicer" mode or "Beat Jump" if the default sampler isn't your priority.
demonstrates exactly where to paste mapping files in the Windows 'Documents' folder for Virtual DJ 7. Optimizing for performance is covered in this scratch optimization guide for Mixtrack users. Are you using a license, or are you trying to connect the controller to the version of Virtual DJ? Numark Mixtrack Pro 2 Controller Review - Digital DJ Tips i--- Numark Mixtrack Pro 2 Virtual Dj Mapping Download
For these reasons, community-made or official alternative mappings are sometimes required. In VDJ, these can be re-mapped to trigger