The AKAI MPC4000 is a professional music production center released by Akai in 2001. It is a powerful sampler and sequencer-based workstation that combines sampling, sequencing, and audio recording capabilities in one unit. The MPC4000 includes a 16-track MIDI sequencer, 8-track audio recorder, and 32-voice sampler. It also features a variety of effects, including reverb, chorus, flanging, and EQ. It is one of the most popular music production tools used by producers and musicians in hip hop, rap, and other genres.