polynominal logo
Synthesizers Drum machines Samplers Effects 8-16bits+ toys HOME

Yamaha DX-7




dx7 e! grey matter
  audio demo trend price : 250€ (400€ with E!)
manual schematics factory patch demo video comments

YAMAHA DX-7 1983)
Digital Programmable Algorithm Synthesizer


The DX7 was the first affordable synthesizer implementing FM synthesis designed by John Chowning: the digital revolution changed the sound forever. In following years, the DX7 will be updated to DX7 Mk2 with some updates.


synth detail

info KEYBOARD (weight: 15 Kg, dimensions: 1018 x 102 x 329 mm) 61 keys with velocity and aftertouch. The main panel features a 16 X 2 lines display (not backlit but can be modded) 42 buttons, 2 sliders for volume and data entry.

Rear panel terminal connectors:
- mono out
- Midi interface
- headphones out
- breath controller input
- sustain footswitch input
- portamento footswitch input
- volume pedal input
- modulation pedal input .

edit VOICES main core 8-bit CPU Hitachi HD-63A03X manages 16 digital voices polyphony based on FM synthesis - the DAC is a 12 bits BA922.

STRUCTURE: the IC YM2128 generates 6 syncable sinewave oscillators or operator each with individual volume settings and pitch detune.

Fm key  Scaling


edit SYNTHESIS 6 sinewave operators organized as algorithms, assigned as carrier or modulator, linked between them on different pathways interacting on their harmonic contents depending on the variable feedback strength.

A- carrier
defines the amplitude and the spectral frequency
B- modulator sets the sound timbre and the relative harmonic contents.

DX7 offers 32 combinations algorithms with frequency ratio or fixed frequency: the output is fed back to its input with 7 different levels feedback, as general rule, high values feedback results in richer harmonic contents.

fm dx

lfo LFO up to 2 modulators (shapes: sine, triangle, saw up/down, square and sample & hold) with adjustable start delay and sync retrigger:
1- PMD modulates pitch
2- AMD processes the amplitude.

the IC YM2819 generates 7 EGs:
- 1 EG pitch: 4-segments structure + 4 time levels.
- 1 EG for each operators: 4-segments structure + 4 time levels
The Scaling Level is a very precise key follower with 4 linear / exponential curves

memory MEMORY:
- 32 RAM patches - Internal RAM is doubled if a cartridge mode "RAM1" is present.
The backup memory works with a CR-2032 lithium battery soldered to the mainboard.
Be aware that there is no ROM factory recall, so it is necessary to use Midi exclusives data for this job.

dx7 battery replacement


repairGREY MATTER E! BOARD EXPANSION This special board can be fitted to upgrade to machine to new functions and features:

- multitimbral
- ten times RAM slots
- monophonic with 8 voices stack
- adjustable random detune (variable range set)
- a user-friendly TX programmability
- controller remap
much more on the Dx7 E grey matter manual.

dx7 grey matter picture installation boardyamaha dx7 upgradevarious e!eprom set
motherboard closeuppic eflat remove

GALLERY E! : board requires a Dx7 with latest OS (only upgradable by EPROM) and requires some advanced skills for soldering and cutting circuit tracks.


lfo EDIT the DX is not famous for easy edit functions, some computer-based editors can help:
- Atari ST: Dx-android, Dx expert or caged ST
- PC: Soundiver, Midiquest, DX-manager, Synlib ...
- MSX: YRM 103-102 cartridge Voicing program also YRM304
- IOS: Yamaha DX7 /TX7 / TX816 Editor
- Hardware: if you are lucky enough, you can try the mega-rare Jellinghaus DX Programmer or brand new DTRONICS DT-7 dedicated controller

Jellinghaus DX Programmer

family OP6 DX FAMILY

TX802 - Tx816 - Tx7 - Sy99 - DX200 - DX5 - dx7 family tree

effet VST PLUGIN / SAMPLED VERSION there are some free and commercial samples set:

  name price link demo
dexed VST plugin VST DEXED free
effet dexed FM emulation
hexter VST HEXTER Free effet hexter dx7
odsay VST MDA DX10 free effet mda dx10
oxe fm VST OXE FM SYNTH free effet oxe fm synth
vx7 vst plugin VST VX7 free effet n/a
fm8 VST Native instruments FM8 commercial effet fm8
free yamaha dx7 samples DX7 BLAZE FREE SAMPLES free dx7 samples n/a


demo official demo from 1983 p1
demo official demo from 1983 p2
demo official demo from 1983 p3
demo official demo from 1983 p4
demo official demo from 1983 p5
demo official demo from 1983 p6
demo official demo from 1983 p7
demo official demo from 1983 p8
demo official demo from 1983 p9

effet Soundcloud DX-7

demo1 demo2 demo2


Yamaha DX7 Frequency Modulation YAMAHA DX7 DEMO 1 Yamaha DX7 E.Piano
Frequency Modulation DEMO 1 E.Piano

dx7 fm synth







DX7 Service manual



testthe second DX7 version offers some update and sounds a bit different, mainly for the different DAC with higher resolution. I made a little comparison test:




original scan




yamaha dx7 milestones




performance on dx7 fm synthesizer




dx7 classic flyer



dx7 classic flyer


GALLERY: custom models
custom models


original scan

original scan
PIC: dx7 tatoo


martin gore dx7
Famous user: Martin gore (Depeche Mode)


original scan
PIC: DX7... badly needs repairs and some overhaul!



fun dx7
VIDEO: fun guy playing DX7!

fun dx7
VIDEO: Cesar Camargo Mariano- an incredible DX7 player! rhythm by Roland TR-909



Yamaha DX7 for sale

Yamaha DX7 for sale





- raw sound
- FM concept


- keys dynamic
- weight
- edit


REVIEW "We are here in front of the history! Massive sound, raw-powerful, hard to tame!"




polynominal logo
      For sale Comment Contact
Synthesizers Drum machines Samplers Effects 8-16bits+ toys HOME

all snapshots*, sounds, texts copyright Polynominal.com / Eric Pochesci
*John Chowning found on wikipedia
*tatoo picture unknown author
*Dx7 broken unknow author
* Martin gore picture unknow author

Yamaha dx7 4 out of 5 based on 16 ratings. price €400