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
IBK 10 Control
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

Mode Machines KPR-1 (Kraut Rock Phaser)

Mode Machines KPR-1 (Kraut Rock Phaser) top

This german phaser is a kind of rebuilt Gert Schulte Compact Phasing A. The Schulte Compact Phaser A was the phaser of the german Krautrock and early Berlin School bands in the seventies. Its got a unique sound, due to a special circuit based around photcells and 2 light bulbs.

The Schulte Compact Phaser A could be described as being a 8 stage phaser, with 2 stages of feedback and a negativ lowpassed filtered feedback path.

This 2010 built unit is based around this design. It uses the Jürgen Haible's (†) Compact Clone phaser DIY project board as basis. All this is hand built and packed into a solid enclosure about the size of a Moog Moogerfooger. Due to this origin of the board, it features the very same good new features of the Jürgen Haible's Krautrock Phaser:

  • original sound
  • relay based FX bypass
  • CV foot pedal in for phasing amount
  • CV foot pedal in for phasing modulation rate
  • switch to stop the modulation lfo at its current position
  • 1/4" sockets and no DIN audio sockets

The somewhat strange speed knob is still like the real Schulte phaser: the knob does not give you a higher rate when turning clockwise, but a longer periode length of the modulation LFO. So you have to think backwards. You have to turn the knob ccw for higher rates.

Mode Machines KPR-1 (Kraut Rock Phaser) board

You can see the two light bulbs surrounded by 4 photo resistors each. The light is modulated by a LFO. The changed light strength gives variable resistance in the photo resistors to modulate the LM741 OP amps of the 8 stages. Because of the light bulb CV to light curve and the photo resistors non linear slope, the modulation is unique. And the overall sound is well known.


Product page of Mode Machines: www.modemachines.com/products/discontinued/krp-1/