Missing cross fader but  everything else works. The M-Audio X Session Pro Midi DJ Crossfader Digital Controller Mixer is a professional-grade USB audio interface designed for DJs and music producers. With 2 channels for connecting audio sources, this controller mixer allows users to easily mix and manipulate audio for a seamless performance. The included crossfader and MIDI capabilities make it versatile for a wide range of music production and performance tasks. The M-Audio brand is known for its high-quality audio equipment, ensuring reliable and professional results for users in the music industry.