SY02 Multimode Filter with VCA

Heres a 2 minute demo featuring the SY02 filter.
1-VCO-SUB going through the filter.
2-Drums going through
3-Self resonating filter modulated by the LFO-NZ module.
4-Vocals going through the highpass filter which is modulated by LFO-NZ
5-Self resonating filter modulated by LFO-NZ module.
6-Vocals going through the low-pass filter which is modulated by LFO-NZ
 

Introduction

The SY02 is a multimode filter with a difference. There are separate cut-off and resonance controls for both the hpf and the LPF. This means you can use the SY02 as a LPF, a HPF, or by combining the two you get a BPF. When used as a BPF, it has the advantage over others in that you have control over the band width and the added advantage of two separate resonance controls.

The SY02 can be used on its own as a filter (by turning up the Initial Level0, but it includes a VCA, this means straight away it can be used with envelopes, without the need of a separate VCA.

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

Note

The SY02 is as close a clone of the MS20 filter as is possible without digital modelling. 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 superceeded 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!

Concussor Modular Synthesizer from Analogue Solutions
Tel:+44 1384 35 36 94 Fax:+44 1384 35 36 94
e&oe (c) 12 2005