Erica Synths SYNTRX II Analog Synthesizer - USA Plug

Some instruments invite experimentation and SYNTRX II dares you to get lost in it. This fully analog desktop synthesizer reimagines the spirit of the EMS Synthi through a powerful modern architecture built around Erica Synths’ most advanced sound circuits. Three analog oscillators, a multimode filter, ring modulator, looping trapezoid envelope, recordable joystick and a digitally controlled analog patch matrix with memory combine into a cable-free system that encourages fearless sound design. With expanded modulation, sequencing, external audio processing and instant patch recall, SYNTRX II delivers deep sonic exploration in a single performance-ready instrument designed for studio production, live improvisation and hybrid setups.

Analog Oscillators, Multimode Filter and Core Sound Engine

Forming the nucleus of SYNTRX II are three analog oscillators that form a flexible and expressive sound source. Oscillators 1 and 2 operate at audio rate with multiple waveforms, octave switching, fine tuning and CV-controlled waveshaping, while Oscillator 3 functions as both an LFO and an audio-rate source with key follow or free-running operation. These signals feed a uniquely designed multimode filter that places high-pass and low-pass sections in series, allowing smooth transitions between low-pass, high-pass and band-pass responses. With resonance increased, the filter self-oscillates into a pure sine wave, expanding its role from tone shaping to sound generation.

Modulation, Randomization and Expressive Control

SYNTRX II excels at modulation by balancing precision with controlled unpredictability. A dedicated sample-and-hold circuit generates stepped voltages for rhythmic or random modulation, while the ring modulator introduces metallic overtones, bell-like textures and complex intermodulation when audio sources interact. The looping trapezoid envelope generator, inspired by the original Synthi design, functions as both an envelope and voltage-controlled amplifier, with adjustable attack, on, decay and off stages for percussive sounds or evolving drones. A recordable joystick adds a highly expressive layer, allowing two bipolar control voltages to be moved, recorded, overdubbed and replayed for dynamic automation across any patch point.

Digital Patch Matrix for Cable-Free Analog Routing

Central to the SYNTRX II workflow is its digitally controlled analog patch matrix, which replaces traditional patch cables with a 16 x 16 routing grid. Each patch point offers three attenuation levels, enabling precise control over modulation depth while allowing signals to be mixed or split without degradation. The matrix supports up to 256 stored patches, instant recall, random patch generation and sequential patch changes, making it equally effective for sound design and live performance. Acting as both a mixer and buffered multiple, the matrix enables complex routings that would typically require large modular systems.

Built-In Sequencing and Performance-Oriented Tools

Beyond free-form patching, SYNTRX II includes a built-in piano-roll sequencer that transforms the patch matrix into a step-based control surface. The sequencer supports up to 16 steps with adjustable gate lengths, multiple play directions and manual or clock-synced operation, with output routed to all three oscillators. Additional stepped modulation sources can be layered onto the joystick axes, adding rhythmic movement to any parameter. Combined with real-time joystick recording, pattern recall and instant patch switching, SYNTRX II becomes a highly playable instrument for evolving live performances.

Connectivity, Integration and Experimental Freedom

SYNTRX II integrates seamlessly into modern studios and performance rigs with DIN MIDI In and Thru, USB MIDI, CV and gate inputs, analog clock I O, stereo line outputs, headphone monitoring and assignable outputs. External audio inputs with envelope follower allow microphones, guitars or drum machines to drive internal modulation, while DC-coupled signal paths enable advanced CV processing. Whether used as a standalone experimental synthesizer, an analog effects processor or the centerpiece of a hybrid setup, SYNTRX II delivers a rare balance of depth, immediacy and character. For producers and performers seeking uncompromising analog synthesis with modern control, Erica Synths SYNTRX II stands as a true instrument, not just a synthesizer.