A dirty noisy sine wave oscillator for the Korg Prologue, built with the logue SDK.
A single sine oscillator run through FM self-feedback, a wavefolder, pitch jitter, noise, and sample rate reduction. Ranges from a subtly unstable sine to something completely broken.
| Control | Function |
|---|---|
| Shape | Drive — soft saturation, adds odd harmonics. LFO on Shape animates the harmonic content over time. |
| Shift-Shape | Noise mix — blends white noise into the output |
| Param 1 — Jitter | Random low-frequency pitch drift, like an unstable analog oscillator |
| Param 2 — FM Fdbk | FM self-feedback — feeds the previous output back into the phase. Low values add warmth, high values get chaotic |
| Param 3 — WavFold | Wavefolder — amplifies the signal then folds it back into range. Stacks harmonics fast |
| Param 4 — SR Redu | Sample rate reduction — holds each sample for longer, dropping the effective rate from 48kHz down to ~1kHz at maximum |
sine → FM feedback → wavefold → drive → noise mix → SR reduction
Download vangelis.prlgunit and transfer to the Prologue using the logue Sound Librarian or logue-cli.
Requires the logue SDK Docker build environment.
# Inside the Docker container
build prologue/vangelis-1/- Subtle instability: Jitter 10–20%, everything else low
- Dirty sine: Shape 40–60%, FM Fdbk 20–30%
- Buchla-style: WavFold 40–70%, Shape low
- Lo-fi texture: SR Redu 30–50%, Noise mix 10–20%
- Chaos: FM Fdbk 70%+, WavFold 50%+, Jitter 30%+