Poseidon Synth 4+

Harry Gohs

    • 3.8 • 31 Ratings
    • $4.99

iPad Screenshots


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.


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


• 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


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


• 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

What’s New

Version 1.5.5

Added deprecated AudioUnit for backward compatibility.

Ratings and Reviews

3.8 out of 5
31 Ratings

31 Ratings

jpdenk ,

Spectacular with one serious complaint

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.

QuinnX. ,

Good potential

After playing with this a little more I find it to be very expressive. Would be nice to hear the original wave dry and blend/mix/morph from that. Great app for soundscapes you can also create some interesting synth patches once you get use to what's under the hood.

shsh101 ,

Pure Awesome-ness! (Thanks for Bluetooth MIDI/audio!)

VirSyn might be the best of the best when it comes to iPad synths. Poseidon is just incredible. Such a wide range of sounds, almost a bottomless canyon in this app alone. The advantage Poseidon might have over Tera synth is in the accessibility of the controls. They are all there right in front of you. And the Arpeggiator is great as usual.
Please add Bluetooth support and i will give 6 stars for every app! :)
Thank you very much.

App Privacy

The developer, Harry Gohs, 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.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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