Plum Audio

Plum Audio designs and sells Eurorack-format modular-synthesis modules, patch cables and accessories. The line-up spans small 2 HP utility modules to full-featured stereo effects and sequencers; most units sit in the USD 149–399 mid-range, with a handful of premium digital processors reaching ~$549. All commerce is handled through the brand’s own web-store and a short list of specialist online synth retailers; there is no brick-and-mortar chain distribution. The company is best-known for packing complex functions—multi-mode filters, granular engines, probabilistic sequencers—into ultra-compact 2 HP and 3 HP aluminium panels while maintaining standard +12 V power draw. Their “1U/2 HP revolution” ethos, purple-anodised knobs and open-source firmware have made modules such as the Andromeda stereo polyphonic oscillator and the Apex granular delay instantly recognisable in crowded racks. Firmware updates and alternate panels are supplied free, reinforcing a hacker-friendly image. Customers are space-conscious Eurorack performers, experimental sound-designers and studio producers who need maximum functionality per HP and value open hardware. They tend to favour portable cases, favour deep modulation over fixed-architecture synths and identify with the DIY/linux-aesthetic of mutable, community-driven firmware. Plum Audio competes in the crowded “high-feature-density micro-module” tier populated by boutique Eurorack makers. It differentiates through relentless miniaturisation without menu-diving, consistent -/+12 V compatibility, and a direct-to-musician supply model that keeps prices mid-tier while specs rival larger premium modules.