CEM and SSM chips in synthesizers

CEM3360 Dual VCA

CEM and SSM chips are analog chips used in many synthesizers.

Curtis Electromusic Specialties

Founded by Doug Curtis (d. 2007), developed a family of signal-processing products for electronic music synthesizers and audio equipment. In 2016, it was announced that the CEM3340 VCO had been remanufactured by On Chip using the original design.

ICs

CEM3310 ENV ADSR
CEM3312 ADSR + VCA
CEM3318 ADSR but microprocessor controlled
CEM3320 24 dB/Oct. Filter (multi)
CEM3328 same but LPF only
CEM3330 exp/lin VCA
CEM3335 exp VCA
CEM3340 VCO (Saw,Tri,Pulse)
CEM3345 VCO (Saw,Tri,Pulse) with comparator
CEM3350 12 dB/oct Multimode Filter x2 (no notch)
CEM3360 VCA x2
CEM3365 DAC
CEM3371 Envelope x2
CEM3372 24 dB/oct. Filter, Mix, VCA
CEM3374 VCO x2 (PWMable Pulse, Tri, Saw)
CEM3378 24 dB/oct. Filter, Mix, VCA but microprocessor controlled
CEM3379 24 dB/oct. Filter, Pan, VCA but microprocessor controlled
CEM3381 VCA x2 linear
CEM3382 VCA x2 log
CEM3385 24 dB/oct Filter (LoFi)
CEM3387 signal processor 3-4 pole cascade Filter, VC Pan/VCA
CEM3389 signal processor 4 pole Filter, VC resonance, VC Pan/VCA
CEM3391 Microprocessor Controllable: VCF,VCA,Env (ADSR)
CEM3394 Microprocessor Controllable: 1 Synth Voice: VCF,VCA,Env (ADSR),VCMix
CEM3396 Microprocessor Controllable: Wave-Shaper x2 - VCF,VCA
MS1215 (Designed for Marion Systems, Pro Synth) relabeled as PA397 for DSI, orginated as CEM3397 same core design as CEM3396
but with separate external signal (noise/sub/wavetable) input and VCA to mix stage and additional Pan VCA and L/R output stage.
PA381 VCA (low noise)
PA382 VCA (low noise)
PD508 S/H (8x)
5508 predecessor of PD508 same function
5530 30ch multiplex sample&hold (Prophet VS)

Solid State Micro Technology for Music

ICs

SSM2013 Voltage Controlled Amplifier
SSM2014 Voltage Controlled Element
SSM2015 Microphone Preamplifier
SSM2020 Dual VCA
SSM2024 Quad VCA
SSM2030 Voltage Controlled Oscillator: Sawtooth, Triangle, Pulse (with PWM) and Soft Sync
SSM2031 High Frequency Oscillator/Voltage to Frequency Converter
SSM2033 Voltage Controlled Oscillator
SSM2038 Voltage Controlled Oscillator: Sawtooth, Triangle and Pulse (with PWM)
SSM2040 4-Section VCF (Exponentially controllable Cutoff over a 10,000 to 1 range, i.e. >13 octaves)
SSM2044 4-Pole VCF
SSM2045 Music Voicing System : VCF (2-Pole and 4-Pole Low Pass) and Mixer/VCA
SSM2047 Music Voicing System
SSM2050 Voltage Controlled Transient Generator
SSM2056 Voltage Controlled ADSR type Envelope Generator
SSM2100 Monolithic Log/Antilog Amplifier
SSM2120/22 Dynamic Range Processor/Dual VCA
SSM2164 Low Cost Quad VCA (16 pins, intended to replace the SSM2024, although not a drop-in replacement)
SSM2300 8-Channel Multiplexed Sample&Hold

List of synthesizers and which CEM/SSM ICs they use

Akai

AX80: 8x CEM3372 uP Signal Processor -CEM3372 Filter/Mix/VCA
AX60: 6x CEM3394 uP Voice
AX73: 6x CEM3394 uP Voice
VX90: 6x CEM3394 uP Voice
VX600: 6x CEM3374B (IC1), 1x CEM3378 (IC5), 9x SSM2300 (IC 10-14 & IC 20-23)

Aries System 300 modular

AR-338 oscillator: 1x SSM2030
AR-341 dual oscillator: 2x SSM2030
AR-344 dual envelope: 2x SSM2050

Banana: Banana created by Synthesizerstudio Bonn, since 1999 the SSB is closed..

Poly Synth: 12x CEM3310 EG, 12x CEM3340 VCO, 18x CEM3360 Dual VCA, 6x SSM2044 VCF

Buchla

296 Programmable Spectral Processor: 8x SSM2020 VCA, 1x CEM3360 Dual VCA

Cheetah

Cheetah MS6: 6x CEM3396 VC Waveshaper

Crumar

Performer-2: SSM2040, SSM2050
Trilogy: 6x CEM3310 EG, 6x CEM3320 VCF, 6x CEM3330 Dual VCA, 1x SSM2020 VCA
Stratus: 6x CEM3310 EG, 6x CEM3320 VCF, 6x CEM3330 Dual VCA, 1x SSM2020 VCA, 1x SSM2055
Composer: 2x CEM3310 EG, 2x CEM3320 VCF, 2x CEM3330 Dual VCA
Spirit: 2x CEM3340 VCO, 2x CEM3350 Dual VCF, 3x CEM3360 Dual VCA
Bit 01: 6x CEM3328 VCF Late Models, 6x SSM2044 VCF Early Models
Bit 99: 6x SSM 2044 chips as the VCFs

Digisound-80 modular

80-2 VCO: CEM3340 VCO
80-3 VC LFO: CEM3340 VCO
80-4 VC Mixer: 3x CEM3330 dual VCAs
80-6 VCF: CEM3320 VCF
80-7 VC State Variable Filter: SSM2040 VCF
80-7A VC State Variable Filter: CEM3320 and CEM3335
80-8 Dual ADSR: 2x SSM2050 EGs
80-9 Dual VCA: CEM3330 dual VCA
80-10 Voltage Controlled Envelope Generator: CEM3310 EG
80-16 Dual Resonant Filter: CEM3350 dual VCF
80-18 Dual Multi-Function EG: 2x CEM3310 VCEGs
80-19 Dual VC LFO: CEM3374 and CEM3360
80-C9 Voice Card: 2x CEM3310 VCEGs, 2x CEM3340 VCOs, CEM3360 dual VCA, CEM3372 signal processor

Doepfer

A107 Morph. Filter: CEM3379
A121 Multi Mode Filter/A122 LPFilter/A123 HPFilter: CEM3320
A122 LPFilter: CEM3379 in later versions
A-105 24db SSM Low Pass Filter: SSM2044
A-106-6 XP Filter: CEM3379
A-109 VC Signal Processor: CEM3379
A-111-1 High End VCO: CEM3340
A-130 VCA (linear)/A-131 VCA (exp.)/A-134 VC Panning: CEM3381
A111-2 Dyn. VCO uses CEM3394
Dark Energy, Monophonic Synthesizer: CEM3394 (original model only)

E-MU

Drumulator: 2x SSM2044
SP-12: 2x SSM2044
SP 1200: 2x SSM2044
Emulator-I: 4x SSM2044
Emulator-II: 8x SSM2045 (24 dB/oct analog 4-pole low pass resonant filter (LPF))
Emax: 4x SSM2300 (Sample/Hold Mux), 8x SSM2047 (Filter/Amp)

Elka

Synthex: 8x CEM3320 VCF
EK-22: 6x CEM3396 VC Waveshaper

Ensoniq

ESQ1: 8x CEM3379 VC Signal Processor Filter/Mix/VCA, 1x CEM3360 Dual VCA, 4x SSM2300
Mirage: 8x CEM3328 VCF
SQ-80: 8x CEM3379 VC Signal Processor - Filter/Mix/VCA, 1x CEM3360 Dual VCA, 4x SSM2300
SDP-1: 8x CEM3328 VCF

Fairlight

Fairlight CMI II/IIx: 8x CEM3320 VCF in earlier versions, 8x SSM2045 VCF in later versions

Fender / Rhodes

Chroma: 8x CEM3350 Dual VCF, 8x CEM3360 Dual VCA
Polaris: 6x CEM3374 Dual VCO, 6x CEM3372 Filter/Mix/VCA

Forat

Forat F9000: 4x CEM3320 VCF

Hohner

P120N: 2x SSM2044

Kawai/Teisco

K3(m): 6x SSM2044
SX-210: 8x SSM2044
SX-240: 8x SSM2044

Keytek

CTS-2000: 1x CEM5530 30ch S/H, 8x CEM3389 VC Signal Processor

Korg

Mono/Poly: 4x SSM2033 VCO, 1x SSM2044 VCF
Polysix: 6x SSM2056 EG, 6x SSM2044 VCF
Poly-61: 6x SSM2056 EG

Linn

LinnDrum: 2x CEM3320 VCF, 1x CEM3360 Dual VCA
Linn 9000: 4x CEM3320 VCF

Moog

Memorymoog: 19x CEM3340 VCO, 26x CEM3360 Dual VCA, 12x CEM3310 EG

Oberheim

OB-8 & OB-Xa: 2x CEM3330 VCA (Some OB-Xa models), 2x CEM3360 Dual VCA, 16x CEM3340 VCO, 16x CEM3310 EG, OB-Xa 16x CEM3320 VCF, OB-8 8x CEM3320 VCF
OB-X: 16x CEM3310 EG (2 per voice)
OB-SX: 2x CEM3340 VCO, 1x CEM3320 VCF, 2x CEM3310 EG per voice
Matrix-6 & Matrix-6R: 6x CEM3396
Matrix-1000: 6x CEM3396 (narrow version)
Matrix-12: 12 x CEM3374 Dual VCO, 12 x CEM3372 Filter/Mix/VCA
Xpander: 6x CEM3374 Dual VCO, 6x CEM3372 Filter/Mix/VCA
OB-1 (same as OBI or OB-I): 2x CEM3310 EG
Prommer: 1x CEM3328 VCF
DX: 1x CEM3328 VCF - "Toms" Voice
Stretch-DX: 3x CEM3328 VCF LPF

Octave Plateau

Voyetra Eight: 8X SSM2024 VCA, 8X SSM2044 VCF, 16X CEM3340 VCO

PAiA

Proteus: 2x CEM3340 VCO, 1x CEM3320 VCF, 1x CEM3310 EG, 1x CEM3330 Dual VCA

PPG

Wave 2.2 / 2.3: 8x SSM2044 VCF, 4x CEM3360 VCA
Wave 2: 8x CEM3320 VCF, 8x CEM3310 EG

Roland

SH-101 and MC-202: 1x CEM3340 VCO
MKS-20: 5x CEM3360 Dual VCA
Jupiter-6: 12x CEM3340 VCO, 6x IR3109 VCF, 6x CEM3360 Dual VCA
MKS-80 (to serial #511799/early models): 16x CEM3340 VCO, 8x IR3109 VCF, 8x CEM3360 Dual VCA (4 for X-Mod)
MKS-80 (serial #511800 and higher/later models): 16x IR3R03 VCO, 8x IR3R05 VCF/VCA, 4x CEM3360 Dual VCA (for X-Mod)

RSF

Kobol Expander I: 2x SSM2050 EG, 1x SSM2040 VCF

Sequential Circuits / Dave Smith Instruments

Evolver series: Curtis for Filters
Prophet-5: the first Prophet 5 series used the SSM filter; later they were changed to CEM
- Prophet-5 Rev 1 & 2: 11x SSM2030 VCO, 5x SSM2040 VCF, 10x SSM2050 EG, 21x SSM2020 VCA
- Prophet-5 Rev 3: 11x CEM3340 VCO, 10x CEM3310 EG, 5x CEM3320 VCF, 14x CA3280 VCA
Prophet-10: 22x CEM3340 VCO, 20x CEM3310 EG, 10x CEM3320 VCF
Prophet 600: 12x CEM3340 VCO, 6x CEM3372 VCF/VCA, 4x CEM3360 Dual VCA
Pro-One: 3x CEM3340 VCO, 2x CEM3310 EG, 1x CEM3320 VCF
Prophet T8: 16x CEM3340 VCO, 8x CEM3372 Signal Processor - CEM3372 Filter/Mix/VCA
Six-Trax: 6x CEM3394 uP Voice
Multi-Trak: 6x CEM3394 uP Voice
MAX: 6x CEM3394 uP Voice
Split8: 8x CEM3394 uP Voice
Prophet VS: 1x CEM5510 Fast Sample/Hold, 1x CEM5530 30ch S/H, 8x CEM3382 Dual Low Noise VCA, 8x CEM3378 VC Signal Processor, ?x CEM3372 Filter/Mix/VCA
Prophet 2000: CEM3379 VCF/VCA
Prophet 3000: CEM3387
Studio 440: 8x CEM3389 VC Signal Processor, 1x CEM3360 Dual VCA, 1x CEM5530 30ch Sample/Hold
Drumtraks: 2x CEM3320

Siel

DK600: 2x SSM2031 VCO, 6x SSM2024 VCA, 6x SSM2056, 6x SSM2044 VCF
DK-80: 2x SSM2045 VCF
EX-80: 1x SSM2045 VCF
Opera 6: 2x SSM2031 VCO, 6x SSM2024 VCA, 6x SSM2056, 6x SSM2044 VCF
Kiwi: 2x SSM2031 VCO, 6x SSM2024 VCA, 6x SSM2056, 6x SSM2044 VCF

Simmons Drums

MTX9: 1x SSM2300
SDS9/SDS1000: 3x CEM3394 VC Synth
SDS8: 5x CEM3372 VC
SDS7: CEM3340 - 1x per module; CEM3372 - 1x per module
SDS5: SSM2044 - 1x per module
SDS800: 4x CEM3394

Solton

SM100 analogue synthesizer (6 voices)： Each voice uses 2x　SSM2056 (ADSR) and 1x　SSM2045 (VCA+VCF)
Programmer 24： 1x CEM3350 12 dB Dual VCF & 1x SSM2044 24 dB VCF

Steiner Parker

EVI: ?x CEM3340 VCO, ?x SSM2040 VCF

Suzuki

SX-500: 1x SSM2045 (this synth module is a clone of the SIEL EX-80)

Synton

Syrinx: 2x CEM3310 EG, 2x CEM3340 VCO, 2x CEM3350 Dual VCF, 1x CEM3360 Dual VCA

Waldorf

Wave: 16x CEM PD508 Multiplexer/S&H, 16x CEM 3387 VCA/VCF, 1x Quad VCA SSM2024 for 4 voices.
Microwave1: 8x CEM3389 VCF,VCA,VCP in Rev A, 8x CEM3387 VCF,VCA,VCP in Rev B

External links

References

Curtis Electromusic
Synthesizer Database by Moogulator

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