This optional update lets you swap the 4 original effects of your DJM-350 (GATE, CRUSH, FILTER, JET) to the 4 from the DJM-350-W (NOISE, SHORT ECHO, FILTER, JET).
The effects swap can be reverted by reinstalling the original DJM-350 firmware.
Optional labels for your DJM-350 are also available to make the buttons on your mixer match the new effects.
These labels are called DRW2480 (white) and DRW2481 (black). Please contact customer support for more info.