Source Audio's new modulators—the Mercury flanger, Lunar phaser, and Gemini chorus—all feature deceptively simple interfaces that facilitate both plug-and-play gratification and deep-dive tweaking. Each has four knobs, a 3-position voice switch, and continuous controller input, yet each can be edited in exponentially greater ways—including for bass- or guitar-optimized frequency response— via a slick, powerful mobile app and/or computer software.