Amazon.com: Arturia BeatStep Pro Controller and Sequencer — Aftertouch, Velocity Sensitive, With 2 Independent Melodic Sequencers, Drum Sequencer, 16 Drum Pads, MIDI/CV/Gate I/O and Music Production Software : Musical Instruments
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Akai Professional MPC2500 64-track MIDI Sequencer Sampler w/Cable in Stock | eBay
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A free midi sequencer/editor: Aria Maestosa – Musica Informatica