Some modules give you an oscillator or a filter; this one gives you a programmable studio inside 30hp. The ER-301 Sound Computer is designed as a voltage-controllable canvas for digital signal processing, letting you build entire instruments, effects chains, and sampling systems directly in your rack without ever stopping the audio.
At its core is a flexible library of “units” that you can patch together in real time, from essentials like mixers, VCAs, envelopes, filters and limiters to deep tools such as loopers, granular processors, variable-rate sample players and wavetable oscillators. With 512MB of RAM (around 480MB available for 32-bit floating-point, memory-resident samples), it comfortably handles multi-layered sample instruments and complex microsound patches, while background recording of up to 12 tracks of audio or CV to SD card turns it into a powerful performance recorder or resampling hub.
Interaction is driven by two monochrome OLED displays and a high-quality optical encoder rated for over a million rotations, giving you precise, computer-like control in a tactile hardware form. Four DC-coupled audio inputs, twelve CV inputs and four gate inputs are sampled at up to 60kHz (96kHz for gates), feeding four AC-coupled audio outputs that can run at 48kHz or 96kHz, 24-bit. The focus on audio-rate outputs keeps the ER-301 dedicated to sound generation and processing, while open-source firmware and dual-level SDKs (Lua and C++) invite you to extend the system with your own custom units, graphics and behaviors. Frequent firmware updates, a built-in Package Manager, and an active community sharing presets and user-developed units ensure the ER-301 continues to evolve alongside your patching imagination.
