The Erica Synths Black Quad VCA2 is a highly versatile four-channel voltage-controlled amplifier and mixer module designed specifically for complex modular systems. With its selectable linear/logarithmic response for each channel, manual CV bias and signal level adjustment, and sequential output mixing, this module is capable of being used in various configurations depending on the specific requirements of the user.
One of the key advantages of the Black Quad VCA2 is that it features four independent VCAs, each with its own linear/logarithmic response selector and signal level indicator LED. This allows for highly precise and nuanced control over the output, with the ability to adjust the gain of each channel in isolation.
The module also features sequential output mixing, which means that all outputs are sequentially mixed together, allowing for complex signal routing and processing. Additionally, the CV inputs are normalled to each other, providing further flexibility in terms of configuration.
If no CV is applied, the Black Quad VCA2 can also be used as a signal mixer, further increasing its versatility in a modular setup. The fourth channel is also DC-coupled, making it possible to control CV sources directly.
In terms of technical specifications, the Black Quad VCA2 has a CV level of -10V – +10V and attenuation levels of -80dB (max attenuation) to +3dB (unity gain). The response can be set to either linear or logarithmic depending on requirements.
Overall, the Erica Synths Black Quad VCA2 is a highly capable and versatile module that is well suited to complex modular setups where precise control over signal amplitude and routing is required. Whether being used as a standalone VCA or in combination with other modules, the Black Quad VCA2 is a reliable and powerful tool for any modular synthesist.
Example Usage
If you're new to using voltage controlled amplifiers and mixers in your modular system, the Erica Synths Black Quad VCA2 is a great place to start. You can use it as a basic mixer by sending four audio signals into the four inputs and adjusting the signal level for each channel using the manual knobs. You can also adjust the response of each channel from linear to logarithmic, which will add some variation to your mix. As you become more comfortable, you can experiment with controlling the CV for each channel and adjusting the attenuation levels to create more complex and nuanced audio.
An intermediate-level usage example for the Erica Synths Black Quad VCA2 in a live performance would be to use it in a feedback patch with a synthesizer sequence. Patch two of the channels to the output of the synthesizer and two of the channels to the input of an effects processor. Use the sequential output mixing to blend the dry and wet signals together. Add CV control to the response selector and the signal level adjustment knobs for added expressiveness. This will allow for complex and evolving sounds that can be manipulated in real-time during a performance.
Further Thoughts
One interesting feature of the Black Quad VCA2 is its ability to mix signals even without any CV applied. For example, you could use it to create a submix of several sound sources and then apply further processing to this submix with other modules in your system. Additionally, the 4th channel being DC coupled allows you to use the module not only as a voltage-controlled amplifier but also as a CV processor. For instance, you could use it as a CV attenuator, inverting or polarizing a CV signal coming from another module before sending it to your oscillator or filter. This opens up a whole world of possibilities for creative signal processing and sound design within your modular system.