Everything from retro-style axes to interstellar effects and insanely powerful amps caught our eye in Nashville.

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.