An 8-voice polyphonic digital synthesizer with a 61-note keyboard. Released in 1985.

The DX21 is a cheap consumer level synth, which has said to sound nealy identical to the DX100 and DX27 models. It offers a 4-operator FM engine typical to the DX line. To spice up the sounds a chorus effect is included.
128 patches and 16 performances can be stored in the unit's internal memory. For more storage there is also the traditional tape interface.
The keyboard is not velocity or aftertouch sensitive, but does respond to both from an external source. It can be split and layered, with a mono mode also available.
Other features include pitch & modulation wheels, dual detune and MIDI in/out/thru.

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