Feature-packed VCA for Complex Eurorack Rigs The Erica Synths Black Quad VCA 2 is ideally equipped to handle the complex routing requirements of large Eurorack rigs. This 10HP module contains four individual VCAs with four inputs, four outputs, and four CV inputs to connect envelope generators, LFOs, and other modulators to the VCAs' level controls. The VCA outputs are set up in a sequential output mixing configuration, meaning the output signals sum until the path is interrupted by a patch cable. Then, that output and the previous output (or outputs) sum, leaving the following outputs independent — a standout feature for building uniquely layered combinations. Additionally, the Erica Synths Black Quad VCA 2 improves on its predecessor by providing a switch for selecting between a logarithmic or linear response for each of its four knobs, and it includes signal level indicator LEDs — an add-on synthesists at Sweetwater appreciate when