CEM and SSM chips in synthesizers

From Wikipedia, the free encyclopedia
Jump to: navigation, search
CEM3360 Dual VCA

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

Curtis Electromusic Specialties[edit]

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.


  • 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[edit]


  • 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[edit]

  • 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 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
  • 296 Programmable Spectral Processor: 8x SSM2020 VCA, 1x CEM3360 Dual VCA
  • Cheetah MS6: 6x CEM3396 VC Waveshaper
  • 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
  • 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)
  • Synthex: 8x CEM3320 VCF
  • EK-22: 6x CEM3396 VC Waveshaper
  • 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 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
  • P120N: 2x SSM2044
  • K3(m): 6x SSM2044
  • SX-210: 8x SSM2044
  • SX-240: 8x SSM2044
  • CTS-2000: 1x CEM5530 30ch S/H, 8x CEM3389 VC Signal Processor
  • Memorymoog: 19x CEM3340 VCO, 26x CEM3360 Dual VCA, 12x CEM3310 EG
  • 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
  • Proteus: 2x CEM3340 VCO, 1x CEM3320 VCF, 1x CEM3310 EG, 1x CEM3330 Dual VCA
  • Wave 2.2 / 2.3: 8x SSM2044 VCF, 4x CEM3360 VCA
  • Wave 2: 8x CEM3320 VCF, 8x CEM3310 EG
  • 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)
  • 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
  • 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
  • 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
  • SX-500: 1x SSM2045 (this synth module is a clone of the SIEL EX-80)
  • Syrinx: 2x CEM3310 EG, 2x CEM3340 VCO, 2x CEM3350 Dual VCF, 1x CEM3360 Dual VCA
  • 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

See also[edit]

Early clients
Synthesis & signal processing

External links[edit]