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Yamaha DX-7




dx7 e! grey matter
info Country: Japan
Weight: 14,2 Kg
Dimensions: 1018 x 102 x 329 mm
audio demo trend price : 250€
manual schematics factory patch demo video comments

YAMAHA DX7 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 it is revamped to DX7 Mk2

synth detail

info KEYBOARD 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 synthesizer 16 voices polyphony based on FM synthesis - the DAC BA9221 works at 12 bits. IC YM21280 generates 6 syncable sinewave oscillators or operator each with individual volume settings and pitch detune (EG is generated by IC YM 21290)

Fm key  Scaling

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

DX7 features32 algorithms combinations 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:
- PMD modulates pitch
- 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, also many third part cartridge for more banks including EMW DX70, Interlock TurboDX1, FORAT MAM 2000, Steinberg Monsterram, Yamaha Sound collection voice. 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)
- 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, CTRLR,
- 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 (pic below) Beetle PR7 o modern 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
demo UK-demonstration record-1983

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

how to replace dx7 battery


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

dx7 lego


GALLERY: custom models
custom models


dx7 shirt

original scan
dx7 cat (catsynth.com)

yamaha dx7 tatoo
dx7 tatoo


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


broken dx
DX7... badly needs repairs


fun dx7
videofun guy playing DX7!

dx7 tr909
videoan incredible DX7 player! rhythm by Roland TR-909


monsters alien DX7
video fun scene from cartoon MONSTERS and ALIEN


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!"




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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