Yamaha QX21

Yamaha QX21 is a digital sampling sequencer released by Yamaha in 1988. It was used by many professional musicians and producers, including the likes of Depeche Mode, The Prodigy, and The Chemical Brothers.

The QX21 is a 16-track sequencer that allows users to record and edit MIDI data. It features a built-in 8-bit sampler, a built-in drum machine, and a built-in synthesizer. It also has a variety of effects, including reverb, chorus, and delay. Additionally, it has a built-in arpeggiator and a variety of editing functions, such as quantization, transposition, and looping.