The DX21 is a 4-operator FM synthesizer and one of the most limited of the DX line due to the keyboard's lack of both velocity and aftertouch sensitivity. It has 8 different algorithms available, similar to the other 4-operator Yamaha FM synths, and is patch-compatible with some of the other 4-operator devices, such as the DX27, DX100, and TX81Z.
Year Released: 1985
MSRP: $895
Keyboard: 61 keys
Polyphony: 8 notes
Preset Patches: 128
User Patches: 32
User Performances: 32
Screen: 16x2 character LCD
Power Consumption: 7 watts
Dimensions: 909 mm x 82 mm x 270 mm
Weight: 8 kg
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OLED Display Upgrade - Yamaha TX7 - DX7 - DX9 - DX11 - DX21 - FB-01 ($82.94)
Yamaha DX21 complete Set tactile switch, Replacement ($22.67)
Replacement 3V Battery for Yamaha DX7 TX7 DX21 TG77 RX15 RX17 RX21 + many others ($10.74)
Yamaha Replacement Volume Slider for DX7, DX9, DX11, DX21, DX27, DX100 1980's ($17.95)
Yamaha DX21 Firmware v. 1.5 OS EPROM Update Upgrade DX-21 Rom ($16.14)
Yamaha DX-21 - Firmware OS Update Version 1.5 for DX21 ($16.14)
Yamaha - DX7,DX9,DX21,DX27,RX-series - Phone jack ($6.90)
Key Return Spring for Yamaha PSR-31, PSR-32, DX-21, DX-27, DX-9, CS-5 keyboards ($5)
Touche Clé Yamaha DX27 DX 21 CS CE Series DX9 SK20 CS5 Replacement original Key ($5.29)
Yamaha - DX7/7IIfd/11/21/27 - Mod wheel - Potentiometer ($7.90)
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