Noise Engineering Pura Ruina
Three-stage CV-controlled full-wave rectifier for unique harmonic distortion
8 HP Eurorack module
Pura Ruina is a three-stage full-wave rectifier designed for audio-rate distortion. Full-wave rectification flips negative signal portions to positive, creating harmonic content unlike standard wavefolding or clipping. Stage 1 passes the dry signal; stage 2 applies one round of FWR (doubling the fundamental frequency); stage 4 applies FWR to stage 2; stage 8 applies FWR to stage 4. Each stage has its own volume knob, CV input, and individual output, plus all four feed into a Sum output. Knobs act as offsets when CV is patched. Simple waveforms like sines become harmonically rich, and complex signals get shredded into new textures.
Features
- Three cascading full-wave rectification stages
- Individual CV control per stage (0-5V)
- Global All CV input for simultaneous control
- Individual output per stage plus summed output
- Knobs act as offsets when CV is patched
- Creates unique harmonic distortion unlike wavefolding or clipping
- Can function as a complex VCA with harmonic shaping
Controls & Jacks (15)
- 8 — Triple full-wave rectification stage volume. Acts as offset for CV 8 input.
- 4 — Double full-wave rectification stage volume. Acts as offset for CV 4 input.
- 2 — Single full-wave rectification stage volume. Acts as offset for CV 2 input.
- 1 — Dry signal volume. Acts as offset for CV 1 input.
- In — Audio input.
- All CV — Simultaneous CV control of all four stage volumes. 0-5V.
- Sum Out — Summed output of all four stages.
- CV 8 — CV control for triple rectification stage volume. 0-5V.
- CV 4 — CV control for double rectification stage volume. 0-5V.
- CV 2 — CV control for single rectification stage volume. 0-5V.
- CV 1 — CV control for dry signal volume. 0-5V.
- Out 8 — Individual output for triple rectification stage.
- Out 4 — Individual output for double rectification stage.
- Out 2 — Individual output for single rectification stage.
- Out 1 — Individual output for dry signal.
Explore the interactive Pura Ruina panel on BleepDex — tap any control to learn what it does.
