055U4RY
OSSUARY: horror AUv3 synth
£4.99
A horror AUv3 synth and an AUv3 FX in one app. Fifteen machines that crush, filter and haunt. Play them, or run your own drums, guitar and vocals through it.
055U4RY (say it: "ossuary") is an 8-voice polyphonic AUv3 synthesizer and an AUv3 FX, sealed together inside a haunted DOS terminal. A photographic ASCII skull is the front panel: its jaw hinges open with the amplitude envelope, its eye sockets ignite with the output level, and the whole interface tears, melts and reassembles itself while you play.
THE VOICE
- 15 synthesis engines: detuned saw/square/triangle unison stacks, sine and sub-oscillators one and two octaves down, two-operator FM, ring modulation and inharmonic partials. Every factory preset is a different engine.
- Twin chaotic LFOs that cross-modulate each other's RATE, so pitch and filter drift never repeats. Held notes stay alive and slightly wrong.
- A Shepard-Risset layer tuned beneath every note: five windowed partials in an endless downward glissando - the bottomless-pit illusion of classic horror scoring, fused into the oscillator core.
- A 19 Hz infrasonic tremolo at the edge of perception. On headphones it is a shiver; on a big system it is pressure.
THE CHAIN
- State-variable filter, low-pass or band-pass per engine, with resonance that will scream
- Sample-rate reducer and bit-depth crusher for terminal-grade lo-fi
- Saturating drive stage
- GLTCH: a real-time stutter buffer that seizes and re-loops your signal
- CRYPT: a damped, pitch-black comb/allpass reverb
- GLIDE: exponential portamento up to 1.5 seconds
- DOOM: one macro that leans the chaos, the descent and the tremor deeper into the signal
PERFORM
- 14 knobs, all ASCII, every one audible on every preset
- 15 factory presets with per-preset patch memory: your tweaks persist for each preset, and [RESET] restores the factory sound
- Two-octave on-screen keyboard with octave transpose and note names
- Hardware MIDI in (all sources auto-connect), built-in Bluetooth MIDI pairing, pitch bend, MIDI 2.0 aware
- The skull is your meter: jaw = envelope, eyes = level, decay = how hard you push GLTCH
AUv3 SYNTH + AUv3 FX + STANDALONE
Runs standalone with zero setup, and installs as an AUv3 instrument and an AUv3 FX in your host: AUM, Logic Pro, GarageBand, apeMatrix, WBTRK and any AUv3-compatible DAW, with full parameter automation.
One purchase, every platform: iPhone, iPad and Mac. No accounts, no ads, no data collected - your patches never leave the device.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
⏺ Transmission 1.31 — misbehaving headstones.
In IPad landscape mode the FX part got haunted out of this world, now we chained them back to the graves.
The cursed bats are also have better manners now.
⏺ Transmission 1.30 — the crypt opens for everything else.
055U4RY is now two plug-ins: the AUv3 synth, and a new AUv3 FX. Put a drum loop, a guitar or a whole mix through the same fifteen rites and the same panel you already know.
Buying today or updating from 1.20, everyone gets both. One app, one price.
The developer, LASZLO DOBROVOLSZKI, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- LASZLO DOBROVOLSZKI
- Size
- 2.3 MB
- Category
- Music
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Infrequent
Horror/Fear Themes
- Copyright
- © 2026 Laszlo Dobrovolszki

