via Bubblesound Instruments
First up we have the SeM20st.
The SeM20st is a stereo version of the first module bubblesound put out, the SeM20. It has become one of the classic filters in the EurorackWorld.The SeM20st is the most versatile analog stereo filter on the market today.
The inputs on the Left side are all normalized to the Right, so one input can be turned into a stereo signal.There is an Offset for the Left Cutoff, this allows a wider stereo field and is especially useful if the input is coming from a mono source.The CV inputs on the Left can also control the Cutoff and Resonance of the Right side.The Right side CV Cutoff pot is an attenuvertor, when it's at noon it's off, turn clockwise from noon the pot acts like a normal attenuator, gradually adding the CV to the Cutoff.When it's turned counter-clockwise from noon the CV is inverted, acting like an inverted ADSR.This can be used with a single LFO into the Left Cutoff CV to create a sort of ping-pong with the 2 sides, as the Cutoff goes up on one side it goes down on the other.
The Resonance section is exactly the same as in the SeM20, but with the Stereo version the Resonance is controlled by a VCA, allowing for CV control of the Resonance.The Resonance CV will work with either an LFO or an Envelope.
Outputs: Channel has 4 outputs available:
Low, Band, High and Notch Passes.
The Notch Balance pot sweeps from Low Pass to High Pass and can produce some really nice phasing.
width: 10HP
current draw: +45mA -35mA depth: 35MM
Next we have the SpringVerb
The SpringVerb is a classic analog Spring Reverb Driver with a few extras.
The input signal goes into a state variable filter that is capable of self-oscillation.Then the filtered signal goes to the reverb driver, into the tank and back to a Voltage Controlled Crossfader for a CV-able Wet/Dry.The switch under the filter select switch determines what goes into the "Dry" side of the Crossfader. It can either be pre or post filter.
There is a Voltage Controlled Feedback section as well as CV for the Cutoff Frequency and the Resonance of the filter section.
The Feedback does exactly what it says, it feeds the Post Tank signal back into the input section. It can go from very subtile to guitar and amp style feedback.
The Filter is very similiar to the SeM20, so the Resonance is aggressive.The input can be overdriven a little, depending on what the input is. Unlike the SeM20 it doesn’t really clip, but just like the SeM20 when the input is low and the Resonance is high most of what comes out is Sine waves.
Outputs: Filtered, Reverb Only and Mix
Tank:The SpringVerb comes with a medium decay, 3 spring tank and is compatible with many others.
width: 10hp
current draw: +43mA. -30mA
depth - 45MM with RCA cables plugged in
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