LFO Expander Modulation Processor Adds New Features To Your Old Analog Synths

The LFO Expander Modulation Processor is a € 375 stand-alone add-on for your analog synthesizer, designed to give extra functionality while performing your music.

Its main feature is an LFO generator that lets you control LFO depth and LFO speed.


  • external analog LFO processor
  • generates an LFO and bend signal that can be mixed together
  • LFO and bends controlled by hand, by foot pedal (active/passive) or by control-voltage
  • for Moog minimoog, Yamaha CS80, CS60, CS50, ARP 2600 and all other synthesizers having external inputs for vco, vcf or vca control.
  • LFO depth and rate can be controlled at the same time by one single movement
  • adds vibrato, wah-wah, tremolo, pitch bends or other modulations to your synthesizer
  • allows mixing of a sequencer-cv with your synth’s keyboard-cv so you can transpose sequences in real-time
  • allows attenuation and mixing of cv’s. Control the filter cut-off frequency of your ARP 2600 with a knob that’s just in front of you or add variable keyboard-tracking to your ARP 2600
  • fits on top of your ARP 2600 keyboard, minimoog keyboard etc.
  • LFO range from 0,2 Hz up to 275Hz
  • selectable triangle- or square waveform
  • runs on batteries (2x 9V) or dc-transformer

A compatibility chart is available at the Expander site.

Here some of the reasons behind the creation of the LFO Expander:

  • The Yamaha CS80’s keyboard aftertouch can control LFO-depth and LFO-speed at the same time. If you’ve ever played a CS80, you will know how much emotion this adds to your music. However, applying aftertouch on the keys doesn’t allow for fast playing. By connecting the LFO-expander to the external input, you can control the LFO- depth and speed with a foot-pedal and control pitch, filter or volume on a new manner.
  • If you own a Yamaha CS50 or CS60, you can control LFO depth by applying aftertouch but you can’t control LFO-speed. By using the LFO-expander you can and introduce CS80-like effects on these synthesizers.
  • For minimoog owners, if you want to use a LFO, you have to use oscillator 3 for this purpose since there’s no dedicated LFO on the minimoog. That means you can only use osc 1 & 2 as a sound-source. When connecting the LFO-expander to the vco-input, you have your long-waited-for LFO and make 3-oscillator sounds!
  • Almost every analog synth featuring cv-out & cv-in connectors can profit from the LFO-expander for pitch-modulations: simply connect the cv-out to an input of the LFO-expander and connect the output of the LFO-expander to the cv-in of your synth. Now you can apply vibrato or pitchbends by simply pressing the pedal connected to the LFO-expander or by manually turning the knobs on the expander. Many analog synthesizer do have cv-in & cv-out or vco-control: ARP (Odyssey, ARP 2600) Moog (minimoog, prodigy) Roland SH-series, Promars Yamaha CS-series (CS10…..CS80) Simply check the inputs of your synth.

3 thoughts on “LFO Expander Modulation Processor Adds New Features To Your Old Analog Synths

  1. WTF? 375 euros for just an lfo/cv attenuator? I mean…it doesn't even have a vco on it… What is going on with cv circuits nowadays? Do they make them out of gold?

  2. the problem is not the price …it's what you can do with …
    for the serious conception and small production ( i think ) …it's a normal price .
    for the price of a bad midi controller ?

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