Filter Modules

• Analogue low pass filter
• Based on the Roland System 100M filter
• 24 dB/oct. edge steepness
• Adjustable resonance up to self-oscillation
• Integrated 2-channel mixer
• 2 Modulation inputs with attenuator
• 2 Separate outputs
• Power consumption: 8 mA (+12 V) / 8mA (-12V)
• Width: 10 TE
• Depth: 50 mm

• Voltage controlled multimode double filter, modelled on the CS80
• 12 dB/Oct
• Variable module with extensive tonal possibilities
• Adjustable in 2x frequency, 2x resonance, 3x frequency CV, 2x resonance CV, 2x output
• Filter 1: HP/BR, tracking 1/3-2/3
• Filter 2: LP/BP, tracking full-half
• Inputs: 2x audio, 2x frequency CV, 2x resonance CV, 1 V/O, FM IN
• Outputs: 2x audio
• Width: 20 TE / HP
• Depth: 40 mm
• Power consumption: +42 mA (+12 V) / -42 mA (-12 V)

• Analogue dual filter and noise generator
• Separate low-pass and high-pass filter
• Per filter cutoff control
• Audio input and audio output
• 2 Outputs for white noise
• 2 Outputs for pink noise
• Current consumption: 35mA (+12 V) / 45mA (-12 V)
• Width: 8 HP
• Depth: 35 mm

• Similar circuit design of the Black Polivoks filter with Russian NOS operational amplifiers
• Filter characteristic switchable from lowpass to bandpass
• CV input with attenuator for the cutoff frequency
• Self-oscillating
• Width: 3 TE / HP
• Depth: 35 mm
• Power requirement: +12 mA (+12 V) / -11 mA (-12 V)

• Coil-based filter with independent sound between band-pass filter, phaser and distorted wah-wah
• Controls for filter frequency, input and output level
• Cutoff CV input with attenuator
• Current consumption: 10 mA (+12 V) / 10 mA (-12 V)
• Width: 8 HP
• Depth: 40 mm

Module A-120 is a voltage-controlled 24 dB low-pass filter, which filters out the high frequency components from a sound spectrum while allowing the low frequencies to pass unhindered. The cut-off frequency (corner frequency) determines the point at which this effect occurs. They can be set or modulated both manually and via control voltages (filter modulation, with an LFO for example). The VCF1 is configured as a "transistor cascade" with an edge slope of -24 dB / octave, which is also used in various Moog synthesizers, This results in the typical, "legendary" Moog sound. The resonance (emphasis) can be adjusted at the VCF 1 to the point of self-oscillation. In this case, the filter operates as a sinusoidal oscillator.

• 24 dB low pass 1 (VCF1)
• Voltage-controlled 24 dB low-pass filter
• Width: 8TE / 40.3 mm
• Depth: 65 mm (measured from the back of the front panel)
• Power Requirement: 30mA (12V) / -20mA (-12V)

• Analogue high-pass filter (-24dB/oct.)
• Resonance adjustable up to self-oscillation (with level compensation)
• Adjustable input level and switchable overdrive (post filter)
• CV inputs for cutoff and resonance with attenuator
• Expandable with Black Low-Pass Filter Art.518165 and Black VCF
• Coupler Art.518167 (both not included)
• Current consumption: 25 mA (+12 V) / 29 mA (-12 V)
• Width: 10 HP
• Depth: 35 mm

• New filter module in which so-called opto FETs are used to control the filter frequency
• Dimensions (W x D): 40.3 mm (8 HP) x 65 mm
• Power requirement: 40 mA

Module A-120 is a voltage-controlled 24 dB low-pass filter, which filters out the high frequency components from a sound spectrum while allowing the low frequencies to pass unhindered. The cut-off frequency (corner frequency) determines the point at which this effect occurs. They can be set or modulated both manually and via control voltages (filter modulation, with an LFO for example).

The VCF1 is configured as a "transistor cascade" with an edge slope of -24 dB / octave, which is also used in various Moog synthesisers, This results in the typical, "legendary" Moog sound. The resonance (emphasis) can be adjusted at the VCF 1 up to self-oscillation. In this case, the filter operates as a sinusoidal oscillator.

• Vintage edition with black front panel
• Voltage-controlled 24 dB low-pass filter
• Black front panel
• Width: 8TE / 40.3 mm
• Depth: 65 mm (measured from the back of the front panel)
• Power requirements: 30mA (12V) / -20mA (-12V)

• Special edition
• Special 12 dB multimode filter
• Circuit technology of the "EDP Wasp"
• Black front
• Yellow pot caps
• Width: 8 HP
• Depth: 45 mm
• Power requirements: +30 mA (+12 V)/-10 mA (-12 V)

• Discrete filter with VCA and mixer
• Low pass filter with controls for cutoff, resonance and boost
• Switchable between -12dB/-24dB slope
• Switchable overdrive
• Low-noise discrete VCA
• 3-Channel mixer with level control per input
• CV inputs for cutoff and resonance with attenuator
• 2 CV inputs for VCA
• Current consumption: 100 mA (+12 V) / 100 mA (-12 V)
• Width: 8 HP
• Depth: 25 mm

Module A-124 is a special 12 dB multimode filter using the "strange" filter circuit of the "EDP Wasp" (an analog synthesizer with black / yellow housing manufactured by the UK company "Electronic Dream Plant" at the end of the seventies). Hereby digital inverters would be 'misused' as analog operational amplifiers, leading to distortions and other "dirty" effects that generated the specific sound of this filter. The filter is equipped with a band pass output and a combined low / notch / high pass output. For this output a control knob controls the relation between the low and the high pass signal. If both signals appear at the same level (i.e. the middle position of the mix knob), one obtains a notch filter. Otherwise the low or high pass signal predominates.

• Special 12 dB multimode filter
• Circuit design of the "EDP Wasp"
• Width: 8 HP
• Depth: 45 mm
• Power requirement: +30 mA (+12 V) / -10 mA (-12 V)

• Variable stereo band isolator
• 3 Frequency bands (low, mid, high), each with volume fader and CV input
• Mid band with adjustable bandwidth and frequency: 160 - 10,000 Hz
• CV inputs for bandwidth and frequency of the mid band
• Stereo input
• Stereo sum output
• Stereo output per frequency band
• Current consumption: 100 mA (+12 V) / 100 mA (-12 V)
• Width: 10 HP

• Analogue noise generator
• Provides 7 different noise sources
• 4 Static filters
• Adjustable tilt filter
• 2-Band Baxandall filter
• Power consumption: 39 mA (+12 V) / 17 mA (-12 V)
• Width: 18 TE / HP
• Depth: 50 mm
• Colour: Black

• Stereo multimode filter
• 4-Pole (-24 dB / oct.) state variable filter
• Configurable bandpass characteristic
• Cutoff control and resonance fader
• Two FM CV inputs, one with bipolar attenuator
• Spread CV input for shifting the filter frequencies between left and right channel
• Mono/stereo audio input
• Stereo outputs for high-pass, bandpass and lowpass
• Current consumption: 70 mA (+12 V) / 60 mA (-12 V)
• Width: 8 HP
• Depth: 32 mm

• Analogue 4-pole low-pass filter
• Switchable between two different sounding resonance types: Moog coloration (with make-up gain) and Sallen & Key
• Audio input with gain control for selective overdriving
• Switchable high-pass filter (150 Hz) at the audio input
• Audio outputs for 24 dB, 12 dB and 6 dB slopes
• CV input for resonance
• 1 V/oct. keytracking input with attenuator
• Linear FM input with attenuator
• 2 Expotential FM inputs (unipolar and bi-polar) with attenuator and CV-thru output
• Current consumption: 70 mA (+12 V) / 70 mA (-12 V)
• Width: 12 HP
• Depth: 22 mm