Akai Professional MPC2500 Music Production Center Drum Machine 32-voice drum/phrase sampler with 16MB memory built in, expandable up to 128MB RAM 2 onboard effects processors and a main out effects processor 2 assignable Q-link sliders and knobs for real-time performance control Patched phrase- synchronizes phrase samples to any tempo without changing pitch 10 built-in analog outputs, stereo digital I/O, headphone output and 2 MIDI In/4 MIDI Out