Physical Audio Tetrad [WiN-MAC]

• Product: Tetrad
• Publisher: Physical Audio
• Version: 1.0.2
• Requirements: Windows 11, macOS 10.13 or later (Apple Silicon or Intel Core processor)
• Source: physicalaudio.co.uk/products/tetrad/

Physical Audio Tetrad is a unique synthesizer plugin that bridges physical modeling and granular synthesis into a powerful creative tool. Designed in collaboration with artist Gadi Sassoon, it serves as a “digital twin” of his sculpture-based installation Modes of Vibration.

What Sets It Apart

• Quad Oscillator Engine: Each voice comprises four oscillators offering five modes—Basic, Chords, Modal Chords, Free, and Flex—with ADSR, FM frequency, and FM depth control.
• Quad AM Module: Adds rhythmic complexity through per-voice control over shape, depth, gain, rate (up to 250 Hz), and phase displacement.
• Quad Granulator: Command granular texture with per-voice grain size, feedback, rate (up to 50 Hz), pitch variation, sync, and reverse options .
• Plate Resonators: The final layer features four modeled metal plates. You can set decay, metal cuts, preamp drive, and position each on a virtual stage.
• Deep Modulation Matrix: Over 40 destinations with eight LFOs, envelope followers, MIDI, and MPE sources—fueling dynamic expression.
• Expressive Features: Full MPE support (±48 semitones glide), sidechain input, and quad output for advanced routing capabilities.

Sonic Character & Creative Potential

Tetrad delivers textured, sculptural tones that evolve over time—drones, shimmering harmonics, and granular soundscapes that feel alive. Rather than conforming to traditional synth timbres, it invites discovery and exploration. Users on KVR note it evokes curiosity akin to “a well-designed Reaktor ensemble or Max For Live device”. Synth Anatomy praises its experimental depth while also noting the user interface may feel less tactile than other Physical Audio tools.

Pricing & Availability

Available now across VST3, AU, and AAX on both macOS and Windows, Tetrad is currently priced at $59 / £47 / €47+VAT as an introductory offer. Post July 28, 2025, it will return to its standard price of $99 / £79 / €80+VAT.

Verdict

Physical Audio Tetrad redefines what a synth can be. It’s a mesmerizing tool for sound designers, experimental composers, and anyone eager to sculpt organic, evolving environments. Its strengths lie in its layered signal flow, modulation potential, and tactile creativity. While the interface isn’t flashy, its sonic depth overshadows that slight caveat. For those seeking expression beyond conventional synthesis, Tetrad offers an inspiring and immersive experience.