polynominal logo
Synthesizers Drum machines Samplers Effects 8-16bits+ toys HOME
Hardware for sale     Sample SHOP Report Error DONATE

Yamaha SY-55




Yamaha Sy55

info Country: Japan
Weight: 9,7 kg
Dimensions: 911 (w) x 90 (w) x 325 (d) mm
audio demo trend price : 150€
manual demo comments

Yamaha SY-55
Music Synthesizer (1989)


Digital workstation based on samples-playback, digital filters and an 8 tracks-sequencer.

edit The first Yamaha rompler workstation, leaving the DX7 FM synthesis.


info KEYBOARD 61 velocity keys with aftertouch.
Main panel features a 16 X 2 display, 39 push buttons, 1 slider data and 2 wheels for modulation and pitchbending.

Rear panel terminal connectors:
- Midi interface (IN / OUT / THRU)
- breath controller input
- damp footswitch
- expression pedal input
- click out (metronome for sequencer)
- master audio outs
- headphones out
- 2 card slots for PCM waves and datas (see expansion)

TECH CPU H8/523 unit manages 16 voices polyphony based on 16-bits AW2 Advanced Wave Memory 2 synthesis (IC YM7119 also filter) the SY55 DAC is a Burr-Brown PCM56P.
A patch main architecture is composed by 1, 2 or 4 PCM samples or ELEMENTS read out from internal ROM wavetable. Each PCM ELEMENT can be individually edited with various parameters:

sy55 architecture - volume mix
- pitch tuning
- effect amount
- keyboard zone
- special drum kit mode assigns 61 PCM in a single patch.

WAVETABLE internal 2 MB ROM contains 74 PCM waveforms sampled at 32 / 48 kHz organized 3 categories: acoustic, digital and drums.

wavetable - 50 PCM acoustics samples e.g organs, demo piano
- 8 PCM basic digital waves e.g sawtooth, demo square
- 16 PCM various acoustic drums and percussions


EXPANSION a collection of set of DATA / DATA +PCM cards were available.
AI2 PCM cards are compatible between different Yamaha machines, so you can use SY-99 cards , TG77 RY30 on any 55 series. Note: This list is not complete.

NAME set model pic
Analog synthesizer M. Shinoda 1 VC5501W edit
Brass 2 S5504  
Digi synthesizer sound M.Shinoda 1 VC5502W edit
Drums 1 2 S5502 edit
Modern Artist Soudscape 1 TG-502 edit
Modern Artist Soundsource 1 - edit
Modern Rock classic Soundsource 1 - edit
Rock Pop 2 S5551  
Sax 1 2 S5501 edit
Synth goes live 1 EMS55-R002 edit
Synwave 1 2 S5531 edit


multitimbric section manages 16 parts each with assigned


- reserved polyphony
- pitch tuning
- stereo pan position
- effect level

TIP: the global pitch amount can be assigned to aftertouch or randomized for each note.

FILTER system is also based on a custom IC YM7119 featuring 2 digital resonant filters in cascade, each with a -12dB slope:
TIP: Cutoff can be controller by LFO or dedicated EG, but not both at the same time.

filter 55 - Filter 1 mode is both lowpass and highpass
- Filter 2 mode is only lowpass
demo HEAR filter on choir

edit LFO single delayed digital modulator (shapes: saw up, saw down, triangle, sinewave, square, triangle and sample& hold) for each ELEMENT and 3 destinations:

filter 55 - AMOD: LFO to amplitude
- PMOD: LFO to pitch
- CUTOFFMOD : LFO to filter cutoff
demo HEAR sample and hold on filter

edit ENVELOPE 3 EG families per element:
- AEG amplitude : 4 segments + 5 levels and octave scaling setting.
- PEG pitch: 4 segments + 5 levels and octave scaling setting.
- CEG1 filter: 6 segments + 5 levels and octave scaling with special breakpoints
- CEG2 filter: 6 segments + 5 levels and octave scaling with special breakpoints

manages up to 8 tracks, recording mode in either step mode or real-time with a 1/48 resolution max. The time signature can be user defines in quite all manners (including 1/4, 4/4, 1/8/, 8/8,1/16, 16/16) in addition it is possible to used dotted, triples and ties.


Some extra sequencer functions: event filter, track mixdown, insert, copy, delete and note gate time. Internal tempo rate range from 30 to 260 BMP.
SYNC: sequencer can be slaved to external Midi clock.

demo HEAR factory sequenced song

editEFFECT the DSP YM 3413 handles 34 fully editable effects, including reverb (x8), delay, stereo panning delay, gate and digital distortion. Full effect LIST


demo HEAR distortion + reverb

editMIDI special CONTROLLER section (in utility mode) allows to assign some parameters like filter cutoff, volume, modulations to any control changes on the Midi list.
Full sysex implementation is supported.

edit EDIT many external editors:

- Midiquest (mac/pc commerical )

- MET-55 for (Atari ST) PIC

- Sound diver (PC-MAC)

- Tg-55 editor (win 3.11)

- Tg-55 (linux) PIC

- CTRLR controller

edit MEMORY:
- 64 ROM patches (PRESET LIST) + 64 RAM
- 16 ROM + 16 RAM performances
- 999 sequencer measures
- 8000 sequencer notes.
RAM is doubled using memory cards model MCD-32 or MCD-64.

yamaha sy55 battery replacement edit Battery replacement:
A cr2032 3V soldered to mainboard

edit MODDING we did circuit bent a poor Sy55, some rich digital textures and glitched noises are at fingertips.

circuit bent demo CIRCUIT BENT 1 - 2 - 3 - 4


yamaha tg55

edit TG-55 same synthesis engine with less controls, no more sequencer but extra analog outs. DAC is not BB but analog devices brand maybe depends on revision boards?

yamaha sy22 editSY-22 (1990) vectorial synth: a mix of FM and PCM synthesis. Upgraded later to Sy35. Module version is TG-33
yanaha sy77 editSY-77 (1989) workstation based on RCM synthesis (PCM+FM). Relative Midi module version is TG-77
yamaha sy99 editSY-99 (1991) flagship of the SY series with FM + RCM convolution and samples import
yamaha sy85 editSY-85 (1992) last of the SY : plain rompler with sample import. Module version is TG-500




effet VST PLUGIN / SAMPLED VERSION there are some free and commercial samples set but no VST plugin: :

FREE freewavesamples some free basic Sy/tg 55 samples



brochure sy55 brochure sy55
advert advert hires pic  


Company: Yamaha
Model: SY-55
Class: Synthesizer
Keyboard: 61 dynamic
Dates: 1989
Price: 150
Synthesis: PCM rompler
Resolution: 16 bits
N.sounds: 74 PCM
Polyphony: 16 voices
Multitimbric: 16 parts
Oscillator: 4 PCM
Filter: Digital Low pass
LFO: 1 modulator
Envelope: 3 EGs
Sequencer: 8 tracks
Sync: Midi
Midi: IN / OUT / THRU
CPU: Renesas H8/523



demo factory 1 - 2 - 3 - 4
demo piano: MIDI - EP
demo organ: B3 - pipe
demo brass: 90' - analog
demo bass: wet
demo Synth: 1 - 2 - 3 - 4 - 5 - 6 - 7
demo Pad: 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8
demo Choir: 1 - 2 - 3 - 4
demo Ambient: 1 - 2 - 3 - 4 - 5 - 6 - 7
demo FX: 1

demohave some cool sy55



free korg m3r patches
400 free SY55 patches




1.Turn Power on, wait for display to initialize and enter normal mode.
2.While pressing the [SELECT] switch, press and hold the [EXIT] switch, then the [Utility] switch. You will now see the ROM version and date.
3.To reset to FACTORY SETTINGS, press the [EXIT] switch, which will execute test 31 – Factory Settings. Test mode will then exit


edit Sample SHOP
edit Report Error


- free sample set


Yamaha SY55 FOR SALE

yamaha sy 55 for sale




cpu memory yamaha ym7119
pad machine



REVIEW "Good 90' sweeping pads for really cheap!"

manual manual
-filters -polyphony
-sweep pads
-few interesting waves


Add a comment / review



polynominal logo
Synthesizers Drum machines Samplers Effects 8-16bits+ toys HOME
Hardware for sale     Sample SHOP Report Error DONATE

all snapshots,sounds, texts copyright Polynominal.com / Eric Pochesci - polynominal.com is not associated or affiliated with Yamaha Corporation in any manner.

Yamaha SY-55 Yamaha SY-55 Digital Synthesizer
67 out of 100 based on 1 user ratings
100 to 150 from 1 sellers Sellers: