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audrey ii

Sculpting feedback into sonic art

Brace yourself!

Audrey II is a horrorscape synthesizer designed for fearless exploration of feedback. Unpredictable yet compelling, it transforms chaotic sound into immersive soundscapes. From deep, haunting drones to screeching, otherworldly tones, Audrey II is a sonic beast like no other.
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feedback synthesis?

What is feedback, really? It’s that magical moment when sound loops on itself, evolving into something wild. With Audrey II, we’re taking feedback to the next level using Karplus-Strong synthesis—a fancy term for turning short bursts of noise into rich, self-sustaining tones. Think digital strings, but way cooler.

digital witchcraft

Some say analog is the only way to get that sound… We were surprised too when we heard the first burst of noise coming through our headphones. That warmth, the grit, the unpredictability—it was all there. But here’s the twist: Audrey II is 100% digital, running on the almighty Daisy Seed platform.

Built from the ground up to emulate analog chaos, digital bits power every nuance of Audrey II’s feedback, distortion, and reverb-drenched echoes. It’s pure digital magic that doesn’t just imitate analog—it embraces and amplifies it. What you hear isn’t just a close approximation; it’s a whole new breed of sound that pushes digital synthesis into uncharted territory.
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pristine sound

Powered by the Daisy Seed microcontroller, Audrey II delivers 96kHz / 24-bit audio with the speed of an ARM Cortex-M7 at 480MHz. Equipped with 64MB of SDRAM, it handles complex feedback, drones, and effects seamlessly, pushing digital synthesis into rich, analog-like territory.
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42HP | 213mm

The signal flow

01. Karplus-Strong Synthesis & Distortion
‍The signal begins with Karplus-Strong synthesis, a method of string synthesis that creates resonant, droning tones—adding layers of harmonics to emulate organic vibrations, while feedback and distortion weave in raw, aggressive edges.
02. Reverb
Next, the signal passes through a rich, spacious reverb, allowing the drone and feedback to bloom, creating haunting and immersive atmospheres.
03. Filters
Following the reverb, Audrey II utilizes high-pass and low-pass filters with a body control to shape the sound further, revealing hidden overtones and harmonic textures that can add either warmth or an eerie sharpness to the feedback.
04. Tape Delay Emulation
Finally, the signal reaches a tape delay emulator that further degrades and expands the sound, adding layers of movement, modulation, and a classic tape echo feel that’s both nostalgic and unpredictable.
05. Stereo Output
To top it all off, Audrey II’s stereo output widens the soundstage, creating a sense of depth and space that immerses you in rich, layered textures. With stereo feedback flowing through the chain, each element takes on new dimensions, allowing you to push the boundaries of sonic space.
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Community driven & open source

Audrey II is a collaborative project born from the Synthux Academy community, where music technology enthusiasts, designers, and engineers come together to push creative boundaries. Developed by Nick Donadson from Infrasonic Audio and designed by Roey Tsemah, founder of Synthux Academy, Audrey II embodies the spirit of exploration and innovation that drives this community.
Audrey II’s firmware is available on our GitHub, inviting anyone to dive into the code, make modifications, or build upon its foundation. This open-source approach empowers makers not only to experiment with Audrey II’s sound but to shape its future, contribute enhancements, and share discoveries with the Synthux Academy community. Audrey II is a testament to the creativity that can emerge from collective knowledge and a shared passion for instrument design.
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Inspired by the Little Shop of Horrors legend, Audrey II is here to feed your sonic cravings—minus the bloodlust. (Not affiliated with the original production, just big fans of a plant with attitude).
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