Eurorack Module
Noise VCA
Noise Generator with state-variable VCF and VCA
Noise VCA
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Noise generator with integrated VCF and VCA
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3 direct Outputs:
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White Noise
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Sub F (Random CV)
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VCF Out (Coloured)
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Switchable VCF characteristic:
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Highpass (12db)
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Bandpass (6db)
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Lowpass (12db)
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Adjustable filter resonance (Q)
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Switchable 2nd VCF signal input:
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White noise only
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White noise & external signal combined
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external signal only
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VCA with switchable CV mode:
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linear CV
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0 (mute)
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exponential CV
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Width: 10 HP
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Dimensions: 128,5mm x 50,5mm
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Depth: ≈40mm
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Supply voltage: ±12V
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Current: +12V: ≤45mA; -12V: ≈40mA
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Optionally in banana version
The NoiseVCA is a complete noise-‘voice’ with integrated VCF and VCA – but the range of using possibilities is much more widespread.
Instead of the internal white noise source, an external signal can be used as input for the VCF and VCA too.
» read more
For standard operation, the noise generator is feeding the VCF, followed by the VCA.
The untreated white noise signal (transistor as noise source), a subfrequent random voltage and the VCF signal are available as direct outputs.
The state-variable VCF can be operated in highpass, bandpass or lowpass mode. The cutoff frequency is controllable by the big scale knob (and/or CV), and resonance is adjustable by knob ‘Q’ up to self-oscillation. The filter is providing a very good 1V/oct. tracking.
Optionally, an external signal is addable to the filter’s input, or may replace the white noise source completely.
For modulating the cutoff frequency, the VCF has one 1V/oct. input and a second one, which is adjustable by a potentiometer and which polarity can be inverted by a switch.
The VCA’s input source is switchable between ‘White Noise’, ‘Sub F’ or ‘VCF’.
Its control characteristic can be chosen between linear and exponential, and with the switch in middle position, the VCA is completely muted.
By using the polarizer-knob ‘CV in’, the control voltage for the VCA can be adjusted and inverted. Knob ‘Offset’ is adding an offset voltage in the range from ca. -5V to +5V to the CV signal. Thus, the VCA’s zero point may be shifted in positive or negative direction – determing where the VCA is starting (e.g. with a triangle-wave as CV); or just to turn it loud, if there is no CV. » read less
» read more
The untreated white noise signal (transistor as noise source), a subfrequent random voltage and the VCF signal are available as direct outputs.
The state-variable VCF can be operated in highpass, bandpass or lowpass mode. The cutoff frequency is controllable by the big scale knob (and/or CV), and resonance is adjustable by knob ‘Q’ up to self-oscillation. The filter is providing a very good 1V/oct. tracking.
Optionally, an external signal is addable to the filter’s input, or may replace the white noise source completely.
For modulating the cutoff frequency, the VCF has one 1V/oct. input and a second one, which is adjustable by a potentiometer and which polarity can be inverted by a switch.
The VCA’s input source is switchable between ‘White Noise’, ‘Sub F’ or ‘VCF’.
Its control characteristic can be chosen between linear and exponential, and with the switch in middle position, the VCA is completely muted.
By using the polarizer-knob ‘CV in’, the control voltage for the VCA can be adjusted and inverted. Knob ‘Offset’ is adding an offset voltage in the range from ca. -5V to +5V to the CV signal. Thus, the VCA’s zero point may be shifted in positive or negative direction – determing where the VCA is starting (e.g. with a triangle-wave as CV); or just to turn it loud, if there is no CV.
» read less
Soundfiles
White Noise; VCF out with LFO cutoff frequency modulation and varying settings of Q.
a) White; b) VCF Lowpass; c) VCF Bandpass; d) VCF Highpass
Noise VCA (VCF LFO-modulated) followed by Delay1022 .
Delay1022 and VCA controlled by Peak&Hold (Input: Drum Machine)
Noise VCA (White Noise VCA Out) followed by Delay1022 (filtered with Noise VCA VCF).
Delay1022 and Noise VCA controlled by LFO and/or Peak&Hold (Input: Drum Machine)
Noise VCA with VCF ext. In: XR22VCO FT; VCA Out (White Noise) followed by Delay1022.
Modulations: Peak&Hold (Input: Drum Machine) with Add1
Or listen on
https://soundcloud.com/cg-products/sets/noise-vca
Noise VCA Banana Versions
All CG-Products modules can be also manufactured equipped with banana sockets. Functions, technical specifications and dimensions (3U) are identical to those of the minijack version.
Two different color styles are available:
Model Klassik
Model Helene
Please note: Most CG-Products banana modules have no extra grounding socket. We recommend to use the PCV-2 for proper ground connection with external equipment!
Audio routing
Examples
Simple patches with other (CG Products’) modules
1. Noise VCA controlled by Peak+Hold
The Peak&Hold‘s ‘Release’ output controls the VCA with a dynamic envelope shape, while the Peak&Hold‘s ‘P+H’ output is modulating the VCF’s cutoff frequency.
PEAK+HOLD Input: Drum Machine
2. Noise VCA with external Signal
The XR22 VCO FT‘s squarewave output is applied to ‘ext VCF In’; the Peak&Hold is modulating the Noise VCA’s VCF cutoff frequency and the VCA.
PEAK+HOLD Input: Drum Machine
3. VCF triggered by impulse signal
Short impulse signals can be used to trigger the VCF, generating ‘ping’ like sounds. Here the Peak&Hold‘s impulse output is used to trigger the VCF; its ‘P+H’ output is modulating the filter’s cutoff frequency.
PEAK+HOLD Input: Drum Machine
4. VCF and VCA working independently
When using the internal VCA with white noise (or Sub F) as signal source, the VCF can be used complete independently with another signal; or the VCA can generate dynamic accents to the 1st (VCF) audio output – by shifting the VCA’s offset level. Here the VCF’s audio input is the impulse-triggered Delay 1022.
PEAK+HOLD Input: Drum Machine
5. Sub F modulating CVs
The ‘Sub F’ output can be used to modulate the VCF cutoff frequency and/or the VCA – random sounds such as ‘thunder’ or ‘crackling’ can be generated.
Please note: The panels of the modules are made from untreated natural aluminium, hand printed and varnished. Due to this manufacturing process, their surface may have little scratches or unregularities or may slightly differ in their color appearance.
Purchase – where to buy
Minijack Version
Banana Version ‘Klassik’
Banana Version ‘Helene’