Strymon Superkar+ 32 Voice String Synth for Eurorack

The Strymon SuperKar+ 32 Voice String Synth for Eurorack is a powerful and deeply expressive physical modelling synthesis module that transforms Karplus-Strong synthesis into a versatile modular performance instrument. Designed and built in the USA, SuperKar+ creates everything from plucked and bowed strings to blown pipes, resonant percussion, evolving drones, and richly layered harmonic textures—all within a compact 12HP Eurorack format.

Unlike traditional oscillators, SuperKar+ uses delay-feedback synthesis to generate organic, constantly evolving tones with remarkable realism and responsiveness. Tiny adjustments to attack, decay, damping, and detune dramatically alter the behaviour of the “virtual strings,” allowing for highly dynamic and lifelike sound design. Its intuitive hands-on interface and extensive CV control make it equally suited for melodic composition, generative patches, ambient textures, and experimental modular performance.

Features

• Karplus-Strong physical modelling synthesis engine capable of creating plucked strings, bowed textures, resonant pipes, percussion, and evolving ambient sounds
• Dual independent voice architecture featuring separate Solo Voice and Chord Voice sections for simultaneous melodic and harmonic performance
• Up to 32-note polyphony with both voices supporting up to 16 simultaneous notes each
• Polyphonic MIDI support via TRS MIDI Type-A input for expressive external keyboard control with velocity sensitivity
• Extensive CV modulation inputs for Attack, Decay, Damp, Pitch, Detune, Harmony, and more, enabling deep modular integration
• Smart Harmony engine offering octave doubling, fifths, intelligent chord voicings, and scale-based harmonies
• Selectable musical scales including Major, Minor, Dorian, Lydian, Phrygian, Harmonic Minor, and expanded voicing modes
• Two independent timbre modes switching between string-style positive feedback and hollow pipe/tube negative feedback synthesis
• Integrated glide/portamento control for smooth pitch transitions and expressive melodic movement
• Random per-note detuning for realistic ensemble-style movement and natural organic instability
• Stereo, split-output, and mono output configurations for flexible routing and immersive spatial imaging
• Audio input excitation capability allowing external audio to resonate through the synthesis engine as a sympathetic resonator
• High-performance 520MHz ARM processor with 32-bit floating-point audio processing for studio-quality sound fidelity
• Compact 12HP Eurorack format with shallow 38mm rack depth for easy integration into modern modular systems
• Premium stereo audio path with excellent dynamic range and low-noise performance

The SuperKar+ stands out in the Eurorack world because it combines the complexity and richness of physical modelling synthesis with an interface that remains immediate and performance-focused. Modular users especially appreciate its ability to function as both a complete standalone voice and a deeply interactive CV-responsive sound design tool. Community discussions frequently pair it with modules like the Strymon StarLab and Magneto for expansive ambient and generative modular systems.