The Bubblesound VCA4p is a four-channel voltage-controlled amplifier and mixer inspired by the classic Polyfusion modular VCA design. It is intended for flexible audio and CV amplification, offering both independent channel control and voltage-controlled mixing in a compact Eurorack format.
Each of the four channels features a manual gain control, a dedicated CV input, and a switch that allows selection between linear and logarithmic response curves. This makes the module suitable for a wide range of applications, from smooth amplitude control to more dynamic and expressive modulation behavior.
In addition to functioning as four standalone VCAs, the VCA4p includes a dedicated mix output for combining signals. Internal jumpers allow users to select which channels are routed to the mixer section, enabling custom routing configurations and flexible system design. The module can be used for polyphonic voice control, multi-signal mixing, or complex modulation setups.
Rather than aiming for ultra-clean modern VCA behavior, the VCA4p embraces a more characterful analog response, making it particularly useful in musical contexts where tone and coloration are desirable.
Features
• Four-channel voltage-controlled amplifier and mixer
• Based on classic Polyfusion VCA design
• Individual gain controls per channel
• CV inputs for dynamic amplitude control
• Switchable linear and logarithmic CV response per channel
• Dedicated mix output for summed signal routing
• Internal jumpers for customizable mix routing
• Capable of handling both audio and control voltage signals
• Characterful analog response for musical coloration
Specifications
• Product: Bubblesound VCA4p
• Channels: 4 independent VCAs
• CV Response: Linear / Logarithmic selectable
• Outputs: Individual + Mix output
• Width: 8HP
• Depth: 45 mm
• Power Consumption: +60 mA / -45 mA
Included
• Bubblesound VCA4p four-channel VCA and mixer module