Analogue Solutions SY02 Multimode Filter w/ VCA – Korg MS20 Clone Filter Module

February 23, 2012 · Posted in Uncategorized 

The beating heart of the VOSTOK MATRIXSYNTH!

The SY02 is as close a clone of the MS20 filter as is possible without digital modeling. It uses the same circuit design. It uses all the same components, except for 2. 1 of which will not affect the sound, the other has been superseded by a part that is essentially the same. In all other respects they are the same.

Not all MS20s sounds the same, and for the same reasons not all Filtered Coffees or SY02s will sound identical to each other or the MS20. Reasons could be trimmer setting variations, component tolerances, but these are the consequences of buying analogue! We believe that the FC and SY02 do sound like MS20 filters, if you don’t it must be imagined!

Controls

Input Level
This sets the input level of the audio signal into the filters.

HPF CV
This sets the level of external CV that affects the HPF cut-off. Set at minimum, the external CV has no effect, set at maximum, the external CV has full effect.

LPF CV
This sets the level of external CV that affects the HPF cut-off. Set at minimum, the external CV has no effect, set at maximum, the external CV has full effect.

Initial Level
This sets the initial level of the VCA. It applies a voltage to the VCA that opens it up. Set to maximum, the VCA will pass signals through at full volume. This would be the normal way of using this control. As the control is turned to minimum, the level of the VCA decrease finally to zero. In this case, an external CV is used to control the VCA level (such as an envelope signal).

HPF Cut-Off
This control sets the cut-off frequency of the HPF. As the controls is increased, more lower frequencies are filtered out (only high frequencies are allowed to pass through).

HPF Resonance
This alters the resonance of the HPF. Set to maximum it will self-oscillate producing a continuous sinewave. In this way the SY02 can be used as a VCO.

LPF Cut-Off
This control sets the cut-off frequency of the LPF. As the controls is increased, more higher frequencies are filtered out (only low frequencies are allowed to pass through).

LPF Resonance
This alters the resonance of the LPF. Set to maximum it will self-oscillate producing a continuous sinewave. In this way the SY02 can be used as a VCO.

Volume
This sets the final output volume of the SY02.

Sockets

VCF IN
Audio input to the filters.

HPF CV
External CV input to control the HPF cut-off frequency.

LPF CV
External CV input to control the LPF cut-off frequency.

VCF Audio Out
This is the audio output from the VCF

VCA IN
Audio input to the VCA

VCA CV
External CV input to control the VCA level.

VCA Audio Out
This is the audio output from the VCA

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