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Yamaha DX-21 (1985)

Yamaha DX21

Trend price : 200€

Bi-timbric budget spinoff from classic 6 OP DX7 machines with special analog chorus board.

Overview
KEYBOARD (weight: 8kg) ) 61 Keys. Main pannel features a LCD display (no backlit) , 2 wheels for modulation and pitch bender, 3 sliders and 42 rubber buttons.

Rear
panel terminal connectors:
- stereo main out (or individual for bitimbric mode)
- sustain footswitch input
- portamento footswitch input
- damper footswitch input
- headphones out
- Midi interface
- tape interface
- breath controller input (original is BC1)




Voice
8 digital voices - 4 OP and 8 combinations called "algorithms".

Synthesis
there are 4 sinewave operators organized as algorithms, assigned as carrier or modulator, linked between them on different pathways interacting on their harmonic contents depending on the varable feedback strength: A) carrier defines the amplitude and the spectral frequency B) modulator sets the sound timbre and the relative harmonic contents.
Dx100 offers 8 combinations algorithms with frequency ratio or fixed frequency: the output is fed back to its input with 7 levels feedback, as general rule, high values feedback results in richer harmonic contents.

Performance
system some special performance play:
- poly / mono mode
- portamento set with time
- pitch bender range
- mode wheel r range
- breath controller setting (destination / range)
- dual / split mode: two sounds can be layered (only one from bank A and the other from B) with a detune ratio - the BALANCE sliders adjusts the volume between the 2 sounds. Note that LFO from patch 1 rules on second one.

LFO
2 delayed modulators (frequency range from 0.007 Hz to 50 Hz)
1- LFO amplitude
2- LFO pitch
The modulators can be set to retrigger mode and features 4 shapes: saw, square, triangle and sample & hold.

Envelope
4 EGs: each OP features 1 amplitude EG (4-segments) + 1 general shift. Very simple Key tracking scale less sophisticated than previous DX line.

Effect
internal analog chorus based on BBD IC with no control but ON OFF- pseudo stereo gives a nice warmth to the sound.

Memory
- 32 RAM patches (bank A + bank B)
- 128 ROM (must be loaded by 16 groups or individually).
Sounds can be saved to either Sysex dump or magnetic tape.


Audio demo:


Video Clip:

video clip


Review
OK: -dual - 4 op fm - BBD chorus
NOT : - polyphony (especially for dual)-display- edit
"a special FM synth with internal analog chorus board. Compatible with all series including Dx100, dx27 and tx81z."

cool


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Text , review, special demos copyright polynominal.com / Eric Pochesci

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