When rekordbox(Mac/Windows) is connected using a USB cable to a DJ player (*2) connected to the built-in LAN port (CH1-4) of a DJ mixer (*1),
Pro DJ Link does not work correctly if the version of rekordbox(Mac/Windows) you use is earlier than 4.2.1. Please use rekordbox(Mac/Windows) version 4.2.1 or later.
*1：DJ mixer with built-in LAN HUB (DJM-TOUR1, DJM-2000NXS, etc.)
*2：Only DJ players which support Pro DJ Link feature
even when connected to your computer using a USB cable. (CDJ-TOUR1, CDJ-2000NXS2, etc.)