# Poseidon Synth

> Advanced spectral modeling and analog synthesizer for unique sound design. (iPhone/iPad app by Harry Gohs.)

- Source: https://appshunter.io/ios/app/poseidon-synth/id1045058006 (this page in markdown: same URL + `.md`)
- Developer: [Harry Gohs](https://appshunter.io/developer/382428644)
- Category: Music
- Price: $7.99 (on sale, was $14.99)
- Rating: 4.00/5 from 33 App Store ratings · 51 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 328 MB
- Languages: American English
- Released: 2015-11-07
- Data updated: 2026-08-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/poseidon-synth/id1045058006/reviews.md

## What is Poseidon Synth?

Poseidon Synth - The Ocean of Sound

For all creatures in the ocean of sound - Sonic textures from other worlds, Analog signature sounds,  Cut-through-the-mix leads and silkily smooth pads: Poseidon sets a new standard for sound design and ease of use. All of this was made possible through a combination of the familiar, conceptual simplicity of the analog synthesis and our frequency domain based Spectral modelling synthesis technology.

Spectral model oscillator

Select a basic sound model from over hundred delivered with Poseidon. The basic sound model determines the sound characteristic you want to start: taking a artificial model like “Sawtooth” gives you analog style sounds. Use complex models from analyzed samples for earth shaking ambients and evolving pads.

Model parameters

High level controls allow for changing the spectral shape, the harmonicity and balances the level of residual noise and spectral amount of the oscillator model.

F-Domain Filter

The newly developed F-Domain filter allow for drastic changes in the resulting sound spectrum. Five filter types including lowpass/highpass characteristic can be used to shape the sound. They have the usual controls like cutoff but also very unusual ones like a variable slope ranging from 0 dB to 72 dB / Octave and independent controls for resonance and bandwidth! This kind of controls are only possible in the context of our F-Domain synthesis technology. This results in an extremely clear filter sound with breathtaking fast modulation possibilities.

The filter type “Inverse” interprets the sound model as a "Source" and a resonant body "Filter". The cutoff parameter shifts the filterbase - this is the equivalent to making the instrument body smaller or bigger.

Spatializer

This simple control gives your sound a distinctive moving distribution in the stereo panorama. Every atomic sound particle has it´s own path through the space !

Sound browser

The sound browser in Poseidon gives you a fast selection of sounds based on category and timbre.

Spectral modelling synthesis

• Harmonic/Inharmonic/Noise sound models
• 512 oscillators per voice
• 300 Sound models / 600 factory presets

Unique sound control

• Pitch modulation / Harmonicity control
• Time machine
• Timbre control
• Frequency Domain Filter
• Spatializer

Arpeggiator

• Uses programmable sequences with up to 32 steps. 
• Can trigger single notes and chords.
• Unique randomiser generates Arpeggios with 100% usability.
• 32 Arpeggios included, unlimited user arpeggios possible.
• For each step you can program tie, accent, transposition and note order

Effects

• Chorus
• Phaser
• Flanger
• Distortion (aliasing free!)
• Equalizer
• Echo/Delay
• Reverb

Global

• Audiobus 3 compatible (Input slot)
• Audio Unit AUv3
• Inter-app audio compatible (Instrument/Generator)
• CoreMIDI / Virtual MIDI / Tempo Sync / MIDI Learn
• Audio recorder with Metronome.
• Audio pasteboard / File sharing.
• Ableton Link support
• Bluetooth audio A2DP

## Key features

- Spectral model oscillator
- F-Domain Filter with variable slope
- Spatializer for stereo movement
- Extensive sound browser
- Arpeggiator with programmable sequences
- Built-in effects suite

## Recent user reviews (10 of 51)

All indexed reviews: https://appshunter.io/ios/app/poseidon-synth/id1045058006/reviews.md

### 5/5 — Fantastic user interface!

*2025-03-04, version 1.5.6*

Beautiful, simple, and intuitive interface.  Not overly technical like many other synth apps.  This was a key reason why I bought it.  I want to play music and maybe tweak sounds and there are enough controls to do that. Excellent assortment of presets that are categorized.  Highly recommend this app!

### 4/5 — The prior negative review…

*2024-09-10, version 1.5.5*

Should of updated to positive a while ago. I use this app a fair amount, and the issue with presets has been fixed. But I do have a question - what is the largest wav file sizes in your presets? ( I know I can edit the size after import.)

### 3/5 — Could be better but close to Amazing

*2024-07-07, version 1.5.5*

This app has amazing sounds and potentials but once the Quantize option is turned off for some mpe action,the disappointment sets in-because it cant decide which note is priority and what others to simply hold still-resulting in a chorus of catcalls

### 1/5 — Stopped Working

*2024-01-14*

Is this even the App Store?
Won’t make a sound, no presets either.

**Developer response:** Please try to trash & reinstall from the AppStore. Then start standalone App first to prepare presets for the AUv3 version.

### 5/5 — Cery good

*2023-11-16, version 1.5.5*

Souds like from heaven

### 1/5 — App lädt nicht unter IOS 17

*2023-11-12, version 1.5.5*

Bitte ein Update nachschieben. Die App funktioniert leider nicht.

### 1/5 — Its not loading preset

*2023-07-16, version 1.5.5*

Everything is blank since two weeks

### 1/5 — Doesn’t work anymore

*2023-06-27*

Ipad 16.5, Poseidon 1.4 doesn’t play anymore , the whole Wave page is just blank, all the presets are gone, the oscillator seems missing, zero sound, please advise, virsyn contact page doesn’t work

### 4/5 — Spectacular with one serious complaint

*2023-03-11, version 1.5.5*

I love the sounds and interface in both stand-alone mode and when using the app in AUM, but I’m sorely disappointed that when using it in AUM, I don’t see any way to switch off quantization. I absolutely love having the ability to easily switch off quantization in stand-alone mode and feel it’s really important to have access to that feature when using it in AUM.

### 3/5 — Somewhat working in iOS 12

*2022-12-28, version 1.5.5*

I upgraded my rating after deleting and reinstalling on iOS 12, I got some but not all functionality.

Wave screen still does not completely work.

## Frequently asked questions about Poseidon Synth

### What kind of sounds can I create with this app?

This app allows for the creation of a wide range of sonic textures, from analog signature sounds and cut-through-the-mix leads to silkily smooth pads and earth-shaking ambients. It utilizes spectral modeling and analog synthesis to achieve unique sound characteristics.

### What makes the F-Domain Filter unique?

The F-Domain filter offers advanced control over the sound spectrum, including a variable slope from 0 dB to 72 dB/Octave and independent controls for resonance and bandwidth. This allows for extremely clear filter sounds and fast modulation possibilities, with a special 'Inverse' mode that treats the sound model as a source and resonant body.

### Is this app free to use?

Based on the provided information, this application is a paid product. There are no mentions of free usage, in-app purchases, or advertisements, indicating a one-time purchase model.

### What are the compatibility and connectivity options?

The app is compatible with Audiobus 3, Audio Unit AUv3, and Inter-app audio. It supports CoreMIDI, Virtual MIDI, Tempo Sync, MIDI Learn, and Ableton Link. It also includes an audio recorder with a metronome and Bluetooth audio A2DP support.

### How does the spectral modeling synthesis work?

Spectral modeling synthesis allows you to select from over a hundred basic sound models, which determine the initial sound characteristic. You can then adjust parameters like spectral shape, harmonicity, and balance of residual noise and spectral amount to further sculpt your sound.

## Version history (last 5 releases)

### 1.5.7 — 2025-11-15

- restore missing factory sounds on device restore

### 1.5.6 — 2024-11-27

- Fixes no sound on some devices running iOS18

### 1.5.5 — 2022-06-11

Added deprecated AudioUnit for backward compatibility.

### 1.5.4 — 2022-06-06

- AUv3 GUI fixed

### 1.5.3 — 2022-03-30

- AUv3 Samplerate change detuning fixed
- AUv3 Navigation buttons fixed
- Audiobus / LinkKit updated

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## More apps by Harry Gohs

- [iVoxel](https://appshunter.io/ios/app/ivoxel/id382428641)
- [iSyn Poly](https://appshunter.io/ios/app/isyn-poly/id443141370)
- [Addictive Synth](https://appshunter.io/ios/app/addictive-synth/id447072653)
- [Addictive microSynth](https://appshunter.io/ios/app/addictive-microsynth/id455651228)
- [Harmony Voice](https://appshunter.io/ios/app/harmony-voice/id532501340)
- [AudioReverb](https://appshunter.io/ios/app/audioreverb/id670248970)

All apps by Harry Gohs: https://appshunter.io/developer/382428644

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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 2026-08-04.*