Polyphonic Synthesizer:

Modal 002
Modal 008 (for sale)
Moog One 16
Nonlinear Labs C15
Waldorf Quantum
Waldorf XTk30
Wersi Stage Performer

Monophonic Synthesizer:

Behringer Odyssey
Casio VL-1 Tone
Dübreq Stylophone
Korg M500 MicroPreset (for sale)
MeeBlip (for sale)
Modal 001 (for sale)
Modal Craft Synth
Modal Skulpt
Modulus monoWave
Moog miniMoog (1979 & 2017)
Moog Minitaur
Moog Prodigy
Moog Sub Phatty
Moog Taurus III
Moog Voyager
Sequential Circuits Pro-One
VacoLoco Zira
Waldorf Pulse (for sale)
Waldorf Pulse 2


Synth-Werk Modular
Synthesizers.com Modular


Korg MS-20 mini (for sale)
TTSH (ARP 2600 clone)

String Machines:

ELKA Rhapsody 610
Eminent 310 theatre (for free!)
Hohner String Vox
Logan String Melody
Waldorf Streichfett
Waldorf STVC

Other Keyboards:

Manikin Memotron
Mellotron Micro


ARP Sequencer (clone)
Baloran TriKo
Behringer Mixer MX2642A
Behringer Mixer MX8000
Behringer Rack Mixer RX1602 (2x)
Boss DR-220E
Digital Raagini
EEH DS 500
Electro-Harmonix Small Stone
Georg Mahr Midi-Ratsche
Ibanez Digital Delay DM1000
IBK 10 Control
Korg K25
Kurzweil XM-1 Expression-Mate
Lexicon Model 200 reverb
Modal Craft Rhythm
Mode Machines Krautrock Phaser
Moogerfooger Ring Modulator 102
Moogerfooger 12-Stage Phaser 103
Moogerfooger Analog Delay 104Z
Moogerfooger Murf 105
Moog MP201
OTO Machines BAM
Roland TR-08
Schrittmacher's Inside
Schulte Compact Phaser (19")
Simmons SDS-V
Strymon Timeline
Synthoma Élkorus
VacoLoco Tron
Waldorf 4Pole
Waldorf EQ27
Wersi Voice (BBD FX)
Waldorf midiBay
Waldorf Becher/Mugs


Access MicroWave controller
Alesis Andromeda A6
ARP (Korg mini) Odyssey
ARP Quartet
Crumar Multiman S
Crumar Performer
EES Midi CV7
ELKA Solist 505
ELKA x705
Emu Emax II
Farfisa Soundmaker
Farfisa Syntorchestra
Grp A4
Hohner ADAM
Hohner String Performer
Jen SX1000
Kawai SX-210
Keio Mini Pops 3
Korg PE1000 (Poly Ensemble)
Korg PE2000 (Poly Ensemble S)
Moog Satellite
Oberheim Matrix 6
PPG waves
PPG wave 2.3 (V8.3)
Rhythm Ace 2l
Roland TR 606
Roland M-VS1
SCI model 700
Seiko DS 202+310
Sound-Art Chameleon
Technosaurus Cyclodon
Vermona Piano-Strings
Waldorf Blofeld
Waldorf microQ keyboard
Waldorf Q
Waldorf XT30
Waldorf Gekko Chords
Waldorf Gekko Arp
Waldorf microWave
Waldorf rackAttack
Waldorf Wave
Waldorf waveSlave
Wersi Baß Synth
Wersi String Orchestra


K. Schulze's "Sense"

Helper Apps:

Hz-2-cent Calculator

M@ail & Impressum

© Till Kopper

Sequential Circuits SCI Pro-One Logo

SCI Pro-One overview
(The red power LED on the upper right above the Master Tune knob is a modification)

Finally I own this well known monophonic 1980 synth. Although a stick tell it is out off warranty since the 4th of October 1981 it playing fine thanks the faithful repairs and calibrations done by H.S.

Inside you find some well known analog Curtis chips:

  • 3x CEM 3340 used for the 2 VCOs and the LFO
  • 1x CEM 3320 as 4-pole lowpass VCF
  • 2x CEM 3310 as exponential envelope generators
  • 1x CA3280 transconductance op-amp as VCA
The analog voice is more or less like a single voice of a SCI Prophet 5 rev. 3.

And the following digital chips are used:
  • 8021 8-bit microcontroller, 30 pins, 24 ports (18 actually used), 1k ROM, massive ;-) 64 bytes of RAM
  • Analog Devices AD558 8-bit DAC (only the 6 most significant bits (DB2 to DB7 pins) are used to cover a 5 octave span in 1/12th of 1 V per step. Much like on the EEH DS 500 digital sequencer)

SCI Pro-One back

The Pro-One features these connections on the back:

  • audio out
  • audio in
  • filter CV in
  • gate out
  • cv out
  • gate / ext. clock in
  • CV in

The powercord is not detachable :-(
This is the same bad decision as on the miniMoog. Putting a synth with the non-detachable power cord into a flightcase is not really cool. You have to take care, that the jack is not scrachting over the synth while flight case is moved a bit unfriendly.

I installed the Pro-One Keyboard Replacement Kit to get a silent and more reliable keyboard action. Easy to do kit that just needs screwdrivers to install.