On the XO version, you have to open the backplate to access the trim pot. Turning the trim pot clockwise will increase the preamp gain and vice versa. If you are using an instrument with higher or lower output than a guitar with single-coil pickups you can adjust the preamp gain with a small screwdriver. On the back of the Micro Synth V1, V2 and V3 there is a hole to access the trim pot. The Start and Stop Frequency sliders determine the frequency at which the filter sweep starts/stops and the Rate sets how quickly the sweep occurs. The Resonance slider boosts the selected frequency and sets the degree of sharpness. Sets the time required for the voice signals to reach full volume. Here you can control the completely independent output volume of the input signal, the Sub-Octave, the Octave and the Square Wave. The four sliders set overall “mix” of the voices. The Trigger slider determines the input volume at which the filter circuits will be triggered.ĭon’t set it too high, especially when playing chords because this will make the filter ‘stutter’. It is a complete redesign of the circuit and comes in a small metal case. The Micro Synthesizer XO is the newest version of the pedal. Because Panasonic discontinued the production of the analog chips Electro-Harmonix had to purchase the remaining supply for the reissue version and probably stopped the production when they ran out of them. It uses the same components as the original units. V3 is the Micro Synthesizer reissue and has a 24v wall wart. Like the original Micro Synthesizer, the V2 has a built-in power supply and came in a cardboard box. The V2 was the first version with an On/Off Switch on the backside and an LED. One for the basic circuit and another one that holds the sliders and links the controls to the mainboard. It uses two circuit boards mounted on top of each other (like the V2 and V3). In contrast to later versions, it had no LED and the square wave was labeled as distortion. It had no On/Off Switch on the backside and the Foot Switch was on the left side.
The first Micro Synth was released in 1979. Please contact me if you have any information! V1 Micro Synthesizer 1979 There is only little known about the different versions of the Micro Synthesizer. It was inspired by the sound of the 1970’s analog synths like Moog, Arp, Oberheim, and others. The micro synthesizer creates different timbres by modifying the input signal into different circuits. It is an all-analog design that features a 4 voice mixer and a 2-pole filter. Like many of the great Electro Harmonix (EHX) pedals, the Micro Synthesizer was developed by David Cockerell.
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