The Akai Professional MPC2500 Music Production Center combines a 64-Track MIDI Sequencer with a 32-voice 16bit Stereo Digital Sampler. The MPC is a rock solid sequencing and drum programming machine with 16 velocity and pressure sensitive rubber pads. The unit allows you to sample more efficiently. This composition center is contained in one extremely powerful desktop unit. Designed for professional audio production, the MPC2500`s intuitive and ergonomic interface makes it the ultimate user friendly composition studio. A large LCD screen allows a clear view of sequence data displaying features such as a drum machine `grid`. Continuous MIDI data can be shown as well as edited graphically. The MPC2500 comes with 16MB of onboard memory which can be expanded up to 128 MB of RAM via the optional EXM128 memory card. The MPC2500 has the capability of an optional internal Hard Disk and CD-RW drives.