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GEM S2 / S3 Turbo




gem s2 turbo

info Country: Italy
Weight: 16 kg
Dimensions: 1055 (w) x 116 (d) x 350 (h) mm
audio demo trend price : 200€
manual demo 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
- S3: 76 velocity keys (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 signal out
- 4 AUX analog out
- 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. A S2/S3 patch is composed by 1 or 2 PCM samples that can be combined in 3 modes:

mpu - SO single: 1 oscillator
- DO dual: 2 layered oscillators with volume balancing.
- DC dual: system crossfades 2 times same PCM for better wave rendering.

demo Hear SO vs DO


WAVETABLE the non-expandable ROM (x3) contain 209 PCM coded at 41,7 kHz and 16 bits resolution. Full wavetable LIST. The S2/S3 features some waveforms inspired from classic analog synthesizers e.g Elka Synthex, Roland Jupiter 8.

wavetable 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).
demo Hear rhodes

fx UPGRADE the TURBOKIT is an expansion board with some new features and enhancements including the sample translator which is a tool for samples import.


Download the Turbokit Manual Install procedure

"Well, don't forget the sticker uh!" fx

fx SAMPLES IMPORT is available only if turbo option is fitted which adds 3 import modes:

sample import - floppy MS- DOS & Atari ST format supports .wav .aif - Avalon
- standard SDS Midi dump.
- floppy disk Akai S1000 format

demo Hear imported samples

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
demo Hear filter

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
demo Hear LFO

filter ENVELOPE 2 EGs :

lfo - EG 1 amplitude: 10 segments when note engaged + 10 others when key is released
- EG 2 filter: same as EG1

TIP: 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.
demo hear reverb / demo hear delay


ac PERFORMANCE GEM MIOS is a multi-thread Kernel manages 16 parts with individual settings:

- Midi channel assign

- dynamic zone split

- pitch tune

- stereo panning

- microtonal control 10 scale presets (FULL LIST) + 4 users.
gem s2 tech

fx SEQUENCER is a 16 tracks Midi SMF compliant.

midi import

Some standard edit functions such as copy, insert, delete, quantisizer and microscope edit.

demo Hear - Imported SMF Mid "firelord" music game CBM 64 hit.

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


gem s2 internal

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

fx BATTERY ind 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.

fx MAINTENANCE there are 2 common issues:

- 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.

s2 s3 issues

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


GEM EQUINOX EQUINOX the spiritual son with better memory handling, sounds from WK6/8 series, ,16mb ROM , better DSP



free samples Sadly there is no reliable sample sources nor VST plugins.

if you want to share some




original scan advert

original scan

advert scan
original scan original scan original scan advert gem s3

Company: GEM
Model: S2
: workstation
Keyboard: 61 keys
Dates: 1992
Display: 240 x 64 pixels
Synthesis: digital rompler
Polyphony: 32 voices
Multitimbric: 16 parts
Resolution: 16 bits
Sample Freq: 41,7 kHz
N. PCM: 209 waves
Oscillator: 2 PCM
Filter: LPF / HPF / BPF / BOOST
LFO: 3 modulators
Sequencer: 250.000 notes
Sync: Midi Clock
Midi: IN / OUT / THRU
CPU: 68302
DAC: AD1865N



demo KB gran piano
demo KB rhodes EP
demo KB Hammond B3
demo GUI jazz
demo SYN pan and filters
demo SYN Jarre steps
demo SYN sinewave
demo SYN PPG bells?
demo AC Accordion Amelie
demo BAS 80
demo BAS mellow arpeggiator
demo PAD sweep pad 2
demo PAD filter pad
demo PAD resonance
demo PAD samples Farfisa Polychrome
demo PAD samples from Roland D-50
demo PAD sweep pad
demo PAD ambient noise
demo CHO tepped digital choir
demo DR internal electro drum kit
demo DR imported drum kit
demo PERC Timpani test :)
demo factory demo 1
demo factory demo 2
demo factory demo 3
demo factory orchestral demo
demo XP structure SOVS. DO
demo XP dry than delay
demo XP balancing OSC1/OSC2 sequence
demo XP LFO test
demo XP sds dump cmb 64 imposs speech
demo XP dry than reverbs

demohave some S2





Download free S2 S3 image sounds

- FREE sample set
- More demo

edit Sample SHOP
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GEM S2 for sale

GEM S2 for sale







sliders ICs VLSI general music filter


solid solid
digital power underrated

smart cheap buy

REVIEW "great filtered sweep pads or droning choirs, but obsolete for acoustic emulation. Ruined by stupid technical lacks like 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 Turbo Gem S2 Turbo
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