There are three types of volume adjustments: with the TRIM control, with the channel faders and with the MASTER LEVEL control. What is the difference between them?

Channel faders: These adjust the audio level output from the respective channels for mixing.
MASTER LEVEL: This adjusts the audio level output to an external device from the DDJ-SB3.
TRIM: Adjusts the level of the sound input to the respective channels from the deck of the DJ application.