Firmware History File Model: CDJ-400 Ver 1.30 - The update improves - USB memory device detection time (time between insertion of the USB memory device unitl tracks can be selected) - The reliability when a USB hub (USB 2.0-compatible) is inserted between the PC and CDJ-400 Update if using your CDJ-400 connected to a PC application (Pioneer DJS, Serato Scratch LIVE, etc.). Ver 1.20 - The update improves that during playback of MP3 loops some noise may occur. Ver 1.12 - Added support for DJ Software Application*1 control. If you wish to use the CDJ-400 in conjunction with DJ Software Application*1 please update your CDJ-400. *1: For customers using PIONEER's DJ software "DJS", Update the DJS to Version 1.500 or later before using it with your CDJ-400