With the Numark M6 USB Black you can turn on 4 channels at the same time. Thanks to the 6 phono and line inputs you can connect turntables as well as CD and media players to the mixer. In addition, you play music from your computer or laptop via the USB connection. You also simply pick up your DJ set so that you can listen back later. Do you want to add live vocals or should something be called? Then you connect a microphone to the mixer. The sound you record is processed with the separate equalizer of the microphone channel. This way you ensure that the voice is well suited to the music.