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CEM and SSM chips are analog integrated circuits (commonly called "chips") used in many synthesizers.

**Curtis Electromusic Specialties**

Founded by Doug Curtis in 1979, CEM developed a family of signal processing products for electronic music synthesizers and audio equipment. In 1988, Doug migrated the company to become OnChip Systems. In 2016, it was announced that the CEM3340 VCO had been remanufactured by OnChip using the original design, the CEM3340 RevG. Other manufacturers manufactured copies of the Curtis Chips as well since the patents had expired. Cool Audio produces the V3340 and the V3320. AS ALFA RPAR released the AS3310, AS3320, AS3330, AS3340, AS3345 and AS3360 in DIP and SMD packages.

ICs

CEM3310 ENV ADSR

CEM3312 ADSR + VCA

CEM3318 ADSR (microprocessor-controlled via two voltages)

CEM3320 24 dB/Oct. VC multimode filter

CEM3328 24 dB/Oct. VC LPF

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. VCF, 2-channel mixer, VCA

CEM3379 24 dB/oct. VCF, VCA, VC pan

CEM3381 / PDA381 VCA x2 linear

CEM3382 / PDA382 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, VCA, VC Pan

CEM3391 Microprocessor Controllable: VCF, VCA, Env (ADSR)

CEM3394 Microprocessor Controllable: VCO, VCF, VCA, external input (complete synth voice)

CEM3396 Microprocessor Controllable: Wave-Shaper x2, VCF, VCA

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. Originally labelled MS1215 and designed for Marion Systems MSR-2. Relabeled as PA397 for DSI.

CEM5508 / PD508 Octal Sample&Hold (8x)

CEM5530 30ch multiplex sample&hold (Prophet VS)

**Solid State Music / Solid State Micro Technology for Music**

Solid State Music, later known as Solid State Microtechnology for Music or simply "SSM," was founded by Ron Dow and John Burgoon in 1974, with assistance by Dave Rossum of E-MU Systems. The company originally produced synthesizer chip sets, and provided bare boards for the hobbyist to experiment with early SSM chips. In an unusual pairing, they also produced S-100 bus computer cards, including a Sound Synthesizer Card.[2] SSM was acquired by Precision Monolithics in 1988, who was in turn acquired by Analog Devices in 1990. New SSM-badged IC's continue to be introduced by Analog Devices, but bear little resemblance to the original SSM line. Several early members of the SSM team reformed in 2017 as Sound Semiconductor to develop audio IC's in the spirit of early SSM products.

ICs

SSM2000 Dual Linear-Antilog Voltage Controlled Amplifier 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

S-950: 8x 3387 (Marion Systems MS-9C upgrade only)

VX90: 6x CEM3394 uP Voice

VX600: 12x CEM3374B (IC1), 12x 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 ONE**: 6x SSM2044 VCF Early Models, 6x CEM3328 VCF Late Models**Bit 01**: 6x CEM3328 VCF**Bit 99**: 6x CEM3328 VCF

**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**

A-105 24db SSM Low Pass Filter: SSM2044 A-106-6 XP Filter: CEM3379

A-107 Morph. Filter: CEM3379

A-109 VC Signal Processor: CEM3379 A-111-1 High End VCO: CEM3340

A-111-2 High End VCO II/A-111-3 Micro Precision VCO: CEM3340 A-111-4 Quad Precision VCO: CEM3340

A-111-5 Mini Synthesizer Voice: CEM3394

A-121 Multi Mode Filter/A122 LPFilter/A123 HPFilter: CEM3320 A-122 LPFilter: CEM3379 in later versions

A-130 VCA (linear)/A-131 VCA (exp.)/A-134 VC Panning: CEM3381 A-132-3 Dual Lin/Exp VCA: CEM3360 (early versions)

Dark Energy, Monophonic Synthesizer: CEM3394 (original model only)

**Dynacord**

Dynacord Add-one: 8x CEM3389

**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**

Mirage: 8x CEM3328 VCF

ESQ-1: 8x CEM3379 VC Signal Processor Filter/Mix/VCA, 1x CEM3360 Dual VCA, 4x SSM2300 SQ-80: 8x CEM3379 VC Signal Processor - Filter/Mix/VCA, 1x CEM3360 Dual VCA, 4x SSM2300 SDP-1: 10x 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

PK120/150: 1x CEM3391, 2x SSM2024 PK/MR250: 2x CEM3391, 2x SSM2024 L/D160: 2x CEM3391, 2x SSM2024

**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

Trident: 9x SSM2044 VCF

**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

DPX-1: 1x SSM2013 VCA, 8x SSM2045 VCF, 5x SSM2300

DX: 1x CEM3320 VCF - "Toms" Voice

DMX: 4x CEM3320 VCF - "Conga", "Timbale", "Toms", "Noise" Voices Stretch-DX: 3x CEM3328 VCF LPF

**Octave Plateau**

The Cat SRM: 1X SSM2040 VCF

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

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

9601 Stereo Compressor: 1x SSM2120 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-5 Rev 4: CEM3320, CEM3340, SSI2140

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: 4x CEM5510 Fast Sample/Hold, 2x CEM5530 30ch S/H, 8x CEM3379/CEM3389 VC Signal Processor, 2x CEM3365 Dual DAC Multiplier, 1x CEM3360 VCA

Prophet 2000: 8x CEM3379 VC Signal Processor

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, 1x CEM3372 (SDS9) SDS8: 5x CEM3372 VC

SDS7: CEM3340 - 1x per module; CEM3372 - 1x per module SDS5: SSM2044 - 1x per module

SDS200: 2x CEM3394

SDS400/SDS800: 4x CEM3394

**Solton**

TS3: 3x CEM 3360, 2x SSM 2300

TS4: 1x CEM 3360, 2x SSM 2300

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: 1x CEM3340 VCO, 1x 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 Wersi

Spectra-DX series : 1x SSM2045