Polyphonic Synthesizer:

Kawai SX-210
Modulus 002
Waldorf Blofeld
Waldorf rackAttack
Waldorf Wave
Waldorf XTk30
Wersi Stage Performer

Monophonic Synthesizer:

Casio VL-1 Tone
Dübreq Stylophone
Korg M500 MicroPreset
Modulus monoWave
Moog miniMoog
Moog Minitaur
Moog Prodigy
Moog Sub Phatty
Moog Taurus III
Moog Voyager
Synthesizers.com Modular
VacoLoco Zira
Waldorf Pulse
Waldorf Pulse 2

String Machines:

Crumar Performer
ELKA Rhapsody 610
Eminent 310 theatre
Hohner String Performer
Hohner String Vox
Logan String Melody
Waldorf Streichfett

Other Keyboards:

Manikin Memotron


Behringer Mixer MX2642A
Behringer Mixer MX8000
Behringer Rack Mixer RX1602
Boss DR-220E
Digital Raagini
EEH DS 500
Electro-Harmonix Small Stone
Georg Mahr Midi-Ratsche
Ibanez Digital Delay DM1000
Lexicon Model 200 reverb
Mode Machines Krautrock Phaser
Moogerfooger Ring Modulator 102
Moogerfooger 12-Stage Phaser 103
Moogerfooger Analog Delay 104Z
Moog MP201
Schrittmacher's Inside
Schulte Compact Phaser
Simmons SDS-V (w/o drum pads)
Synthoma Élkorus
VacoLoco Tron
Waldorf 4Pole
Waldorf EQ27
Wersi Voice (BBD FX)
Waldorf midiBay
Waldorf Becher/Mugs


Access MicroWave controller
Alesis Andromeda A6
ARP Quartet
EES Midi CV7
Crumar Multiman S
ELKA Solist 505
ELKA x705
Emu Emax II
Farfisa Soundmaker
Farfisa Syntorchestra
Hohner ADAM
Jen SX1000
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 microQ keyboard
Waldorf Q
Waldorf XT30
Waldorf Gekko Chords
Waldorf Gekko Arp
Waldorf microWave
Waldorf waveSlave
Wersi Baß Synth
Wersi String Orchestra


EM Portal Forum


K. Schulze's "Sense"


© Till Kopper

Vermona Piano-Strings this is ex-gear / sold

Vermona Piano-Strings overview

1978 built in the German Democratic Republic (GDR), the former east German. And although all the lables are in english, it was sold to the UDSSR mainly. There was also a version in the same look, but without the string section, named Vermona Piano.

There is a nice (german only) page about them on the official Vermona page:

The note name lables on the keys and the little dots left of them are now gone. By using pure alcohol I was able to remove the so called permanet felt tip marker writing.

Vermona Piano-Strings opened

It is build like most of the string machines from this time. A high frequency top-oscillator is divided into 12 freqeuncies that make up the top octave. Each of the 12 notes is then divided down by 2:1 several times to create the different octave found on the keyboard and in the footages of the different registers. All this is done with square waves. These are then mixed, filtered or shaped to generate the the sound. Yes, this is just like an typical organ keyboard.

But then comes the very special sections that makes to sound different from a simple organ:
the multiple analog chorus unit.

You can see it under the keyboard action in the picture above.

Vermona Piano-Strings inside

The top oscillator and the top-octave divider ?

Vermona Piano-Strings uses TDA1022 chips

This is one of the three nearly identical chorus FX boards. They are used in different combinations:

The chorus modulation consists of 3 tca350-based indentically boards which are fed with the "dry" signal coming out of each section and controlled by three CV's which waveforms are identically but the second and third ones are out of phase of 120° and 240° respectively with respect to the first. This is virtually the same principle on which is based the famous chorus effect of the Solina String ensemble (and Eko Stradivarius) and most of the other string machines of the seventies. The CV waveforms consist of different combinations of a 0.6hz (slow) sinewave and a 6hz (fast) sinewave. Different presets for the modulation sections are available (4 for each section), and are selectable by pressing the eight corresponding switches on the left hand side of the front panel.
The presets for the percussion section are:

  • direct: no chorus is applied to the signal
  • slow: only the slow sinewave is used as CV for the chorus. Only the output of the first stage is used and mixed at a 1:1 rate with the "direct" signal (the schematics read "phase shift" for this preset, though it is in fact a chorus)
  • chor1: only the slow sinewave is used as CV for the chorus, though this time all of the three stages are used, and their outputs are mixed together a a 1:1:1 rate
  • chor2: the CV waveform is the sum of the slow and fast sinewaves, all three stages are used and their outputs are mixed together at a 1:1:1 rate
The presets for the strings section are:
  • direct: same as the direct of the percussion section
  • fast: the CV waveform is built up of the fast sinewave and an attenuated version of the slow one. Only the output of the first stage is used and mixed at a 1:1 rate with the "direct" signal (the schematics read "vibrato" for this preset, though it is in fact a chorus)
  • chor1: same as the chor1 of the percussion section
  • chor2: same as the chor2 of the percussion section
(thanks to Giulio for his detailed description above)

In the unit I used to own were TDA1022s on a little additional subboard. It is not clear, if this was a substitude for a repair job, or done because of the lack of the TCA350. These analog chips are the very types as found in nearly all other string machines I got here.

The blue flag under the instrument is an original flag of the "Junge Pioniere", a former east german youth organisation ruled by the goverment. The words in the flag under the flames of the torch translates to: "be ready". No this is history here in the reunited germany for more then 25 years.
Read more about this part of the newer german history here.

Here is a video by Giulio: www.youtube.com/watch?v=rSr2h4uW60I