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GEM S2 / S3 Turbo




gem s2 turbo

info Country: Italy
Weight: 16 kg
Dimensions: n/a
audio demo trend price : 200€
manual demo video free disk library comments

Gem General Music S2 / S3
Music Processor (1992)


An ambitious synthesizer-workstation project from the Italian society Galanti right after their successful keyboard WS-2, later in 2009 Gem declared bankruptcy.

S Workstation has been released in 2 versions with same engine:
- S2: 61 velocity keys with polyphony aftertouch (weight: 16 kg, dimension 1055 x 116 x 350 mm)
- S3: 76 velocity keys with polyphony aftertouch (weight: 18,5 kg, dimension 1077 x 116 x 350 mm).

Gem s2r rack version

info KEYBOARD main panel features a 240 x 64 pixels display, 86 buttons, a wheel, 7 sliders assignable to parameter or Midi CC# and 2 wheels for modulation and pitchbender.

Back panel terminal connectors:
- double Midi interface
- main out
- AUX out (4)
- volume pedal input
- 2 pedalswitches assignable to damper / expression / start-stop / patch change.

editVOICE core is based on a CPU Motorola 68302 at 16 MHz manages 32 voices polyphony - 18 bits resolution DAC model AD1865N.

Full rompler core, a S2/S3 patch is composed by 1 or 2 PCM samples that can be combined in 3 modes:
- SO single: 1 oscillator.
- DO dual: 2 layered oscillators with volume balancing.
- DC dual: system crossfades 2 times same PCM for better wave rendering.


WAVETABLE the 3 non-expandable ROMS contain 209 PCM coded at 41,7 kHz sampling rate and 16 bits resolution.The ROM wavetable is organized into 16 instrument categories (piano, reed, string, effects, chromatic, pipe, ensemble, ethnic, organ, synth lead, brass, percussive, guitar, synt pad, bass and drumkit).
Excluding the traditional GM Midi set, the S2/S3 features some waveforms inspired from classic analog synthesizers like Elka Synthex, SCI Prophet 5 or Roland Jupiter 8.
Full wavetable LIST.


the TURBOKIT is an expansion board with some new features and enhancements including the sample translator which is a tool for samples import. Well, don't forget the sticker uh!
fx Download the Turbokit Manual Install procedure



is available only if turbo option is fitted which adds 3 import modes:
- floppy disk MS- DOS & Atari ST format supports .wav .aiff and Avalon
- floppy disk Akai S1000 format
- standard SDS Midi dump.

sample import

filter FILTER
2 independent resonant multimode filters, each provides a -12 dB per octave slope and combined they operate as a single 4-poles filter:
- lowpass
- highpass
- bandpass
- parametric boost / cut.


fx LFO up to 2 interchangeable and Midi syncable modulators (shapes: sinewave, triangle, sawtooth, square, random and sample & hold) and 4 destinations:
- LFO to amplitude
- LFO to pitch
- LFO to filter 1 / filter 2.


filter ENVELOPE 2 EGs :
- EG 1 amplitude: 10 segments when note engaged + 10 others when key is released
- EG 2 filter: 10 segments when note engaged + 10 others when key is released.
It is possible to select also a 1 / 3 /6 macro segments all edited graphically using the data encoder.


the DSP DISP1 handles 2 main engines:
- DSP 1 is dedicated to reverb and echoes
- DSP 2 is focuses to modulation like chorus, flanger, phaser and organ rotary speaker.

Full effects DSP1 / DSp2 LIST.

ac PERFORMANCE GEM MIOS is a multi-thread Kernel manages 16 parts with individual settings:
- Midi channel
- dynamic zone split
- pitch tune
- stereo panning
- microtonal control 10 scale presets (FULL LIST) + 4 users.

gem s2 tech

is a 16 tracks Midi SMF compliant.
Some standard edit functions such as copy, insert, delete, quantisizer and microscope edit.
demo Hear - Imported SMF Midi files "firelord" music game, Commodore 64 hit.


many CC# are supported but MIOS cannot handle extended Midi Sysex.
Full control change LIST.

- 250.000 notes
- 16 songs
- 512 Kb sample RAM up to 2Mb using additional SRAM UPD431000 (VIDEO)
Data can be saved only to disk HD 3.5” formatted at special 1,62 Megabytes file system.

gem s2 internal


fx MAINTENANCE there are 3 common issues:
- BATTERY famous internal Ni-cad 3.6V battery leakage. To replace it unsolder the battery, clean the board from the acid-salt and eventually replace it with a fresh one.
- ENCODER jumping encoder needs cleaning with q-tips and an appropriate liquid solution .
- DISK DRIVE may fail, try a good cleaning first. It should be possible also to install an USB emulator in the future.

varta leaks2 s3 issues
"I am in your board, killing your synth"


fx GEM S series FAMILY



S2R rackmount version- TURBO native option is fitted

gem sx2

SX2 should be a scaled down S2 version with arranger and resonant filter.

Not much info about this one, but on this VIDEO I heard some quite similar sounds.

GEM EQUINOX EQUINOX the spiritual son with better memory handling, sounds from WK6/8 series, drawbars function,16mb ROM , better DSP and much more VIDEO




  name price link demo
free samples Sadly there is no reliable sample sources nor VST plugins.

We will make some free S2 sounds soon or later.
In the meantime if you want to share some


n/a n/a


demo filter pad
demo sinewave
demo Jarre steps
demo sweep pad
demo rhodes EP
demo Hammond B3
demo Accordion Amelie
demo samples from Farfisa Polychrome
demo samples from Roland D-50
demo pan and filters
demo sweep pad 2
demo resonance
demo balancing OSC1/OSC2 sequence
demo imported wav drum kit
demo PPG bells?
demo LFO test
demo stepped digital choir
demo Timpani test :)
demo 70 mellow arpeggiator
demo internal electro drum kit
demo ambient noise
demo my old track :) all s2 filters
demo factory demo 1
demo factory demo 2
demo factory demo 3
demo have some nice s2 demo? upload!



Generalmusic S2 Turbo Demonstration Gem S3 Monolith patch my texture pads
Generalmusic Demonstration Monolith patch texture pads

gem s2 picture

Company: GEM
Model: S2 / S3
: 61 / 76 Keyboard
Dates: 1992
Price: 200€
Synthesis: digital rompler
Polyphony: 32 voices
Resolution: 16 bits
Sample Freq: 41,7 kHz
N. PCM: 209
Oscillator: 2 DCO
Filter: LPF / HPF / BPF / BOOST
LFO: 3
Sequencer: 250.000 notes
Demo: 26






free S2 S3 image sounds


- FREE sample set
- More demo



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gem s3
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GEM S2 for sale

GEM S2 for sale



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sliders ICs VLSI general music filter

Dates: 1992
Price: 200€
Synthesis: digital
Polyphony: 32 voices
Resolution: 16 bits
Sample Freq: 41,7 kHz
N. PCM: 209
Oscillator: 2 DCO
Filter: LPF / HPF / BPF / BOOST
LFO: 3
Sequencer: 250.000 notes

smart buy

REVIEW "great filtered sweep pads or droning choirs, but obsolete for acoustic emulation. Tuined by stupid technical lacks like memory and Midi exclusives. Give it a try: bargain price on second hand marke. A true old.. gem! :) "

manual manual
-filter - storage
- some waveforms
- no Sysex
- great masterkeyboard - memory system
  - acoustic PCM

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Gem S2 S3 3.0 out of 5 based on 156 ratings. price €150