: If using the USB/Bluetooth channel (Ch 5/6), use the MENU or mode button to toggle between Bluetooth, USB drive playback, and PC interface modes. M6 USB - Quickstart Guide - Numark
: Use the included power supply or connect via a USB data cable to a power source or computer. Switch on your audio sources first, then the mixer, and finally your speakers/amplifiers. drembo m6 mixer user manual