The Acetone California Swirls is an analog chorus effect modeled after the classic "lush" sounds of the 1970s. The circuit is based on the legendary MN3007 Bucket-Brigade-Device (BBD), renowned for its warm and organic modulation. This pedal was developed in close collaboration with vintage specialists to capture the sonic depth of early Japanese rack units. It features a dedicated Swirl control that adjusts the interaction between Rate and Depth for more complex textures. This version is part of the limited "California Series," which focuses on iconic West Coast studio guitar tones.