# Sunnandaeg — Cybernetic Feedback Synth

> Cybernetic Feedback Synth (iPhone/iPad app by Kei Odaka.)

- Source: https://appshunter.io/ios/app/sunnandaeg/id6807615298 (this page in markdown: same URL + `.md`)
- Developer: [Kei Odaka](https://appshunter.io/developer/6807615300)
- Category: Music
- Price: $4.99 (on sale, was $5.99)
- Age rating: 4+
- Requires: iOS 18.0 · 2 MB
- Languages: American English
- Released: 2026-09-30
- Data updated: 2026-10-17

## What is Sunnandaeg?

Sunnandæg is a single-voice instrument. One sine oscillator runs through three folding stages, and the end of that chain is wired back into the oscillator's pitch, sync and FM.

There is no keyboard and no sequencer. You play it with four XY pads, the camera, and the tilt of the device. Raise the feedback and the folding starts folding itself, and the same gesture stops giving the same answer.

SIGNAL
Three folding stages: a squaring drive, a triangle wave folder, a full-wave rectifier. Their order can be swapped. A feedback network of three lines, each taking a stage output, the filter, the resonant EQ, or white or pink noise, and sending it back into a folding stage.

FILTER
Twin Peak — two resonant peaks with their own positions, range and band mode. Push Q far enough and the filter sings on its own.
Rez EQ — eight resonators on fixed frequencies from 60 Hz to 9.8 kHz, each driven by its own source, able to feed both itself and the oscillator.

MODULATION
A sample and hold with a slope output and a comparator gate. An eight-stage shift register with a stepped three-tap mode. Two LFOs, the camera, and tilt. Every source chooses its own destination: pitch, filter, any folding stage, feedback or pan.

EFFECTS
Delay, reverb, phaser and chorus, each with two parameters and a modulation source, plus a random switcher.

MICRO SOUND
Record through the microphone and play the material back in grains, mixed against the dry voice.

ALSO
Twelve preset slots. A gesture recorder that replays your pad movements. MIDI in and out. An eight-band EQ, a compressor, a leveller and an output ceiling.

Nothing leaves the device. The app makes no network connections at all.

## Is Sunnandaeg safe?

Not enough ratings yet to assess Sunnandaeg.

## Is Sunnandaeg legit?

Sunnandaeg appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Sunnandaeg is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1.1 — 2026-10-05

The look has been rebuilt as a technical drawing — soft shadows replaced by
thin ink lines on white paper.

・The four corner keys are named, and their sliders read consistently.
・The upper-left key is renamed from TILT to SETTING.
・The camera panel is rebuilt, with the numeric readouts removed.
・The Feedback Network panel is aligned to the S&H panel at the bottom, and
　its contents redistributed to fill the panel.
・Destinations are gathered onto one card, and the pad gains a sample-and-hold.
・The manual follows the same drawing style.

### 1.0 — 2026-09-30

No release notes.

## More apps by Kei Odaka

- [Saeternesdaeg](https://appshunter.io/ios/app/saeternesdaeg/id6807687659)
- [Ferrec](https://appshunter.io/ios/app/ferrec/id6807860695)
- [VGACam](https://appshunter.io/ios/app/vgacam/id6813754422)
- [Frigedaeg](https://appshunter.io/ios/app/frigedaeg/id6813849843)
- [Thunresdaeg](https://appshunter.io/ios/app/thunresdaeg/id6813862696)

All apps by Kei Odaka: https://appshunter.io/developer/6807615300

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-17.*