AddStation 4+

Additive synthesis machine

Harry Gohs

Designed for iPad

    • 4.5 • 30 Ratings
    • $7.99



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The next generation of additive synthesis

Additive synthesis is a sound synthesis technique that creates timbre by adding sine waves together. The timbre of musical instruments can be considered to consist of multiple harmonic or inharmonic partials or overtones. VirSyn already has a remarkable track record of products ( CUBE, POSEIDON ) trying to make this virtually unlimited synthesis method manageable for creative sound designers and musicians. AddStation is the next step forward giving you a tool to explore completely new sonic territory. The massive amount of sine waves in AddStation - thousands per voice - together with unique morph sequencing blocks blur the frontiers between analog and digital sonic realms.
And all this integrated in all relevant iOS production environments especially the emerging AUv3 AudioUnit standard.


• Fractal additive synthesis
• over 170 sound presets
• Four parts with 8 Additive Sequence Blocks
• Sound morphing
• up to 512 partials per voice with independent AD envelopes
• harmonic/inharmonic spectra
• Ringmodulation
• arbitrary filter function and noise spectra
• four independent analog style Arpeggiators


• Chorus
• Phaser
• Flanger
• Overdrive
• Parametric EQ
• Echo/Delay
• Reverb


• AUv3 for Host integration
• Audiobus 3 compatible (Input slot) with state saving
• Support for Ableton Link.
• Inter-app audio compatible (Instrument/Generator)
• CoreMIDI / Virtual MIDI
• Audio recorder.

What’s New

Version 1.3.1

- "Save as" bug fixed
- crash on specific Preset fixed.

Ratings and Reviews

4.5 out of 5
30 Ratings

30 Ratings

eight 2901 ,

Kawai K5000 killer

I no longer miss my K5000 and its control over partials. This beats it for sound and ease of editing. Thanks! A couple of requests and a bug: Would be nice to have a way to mute parts and adjust their volumes in the Block Edit window. And maybe a sequencer for the blocks? And a way to use the Sequence page without obstructing the time bar with our fingers? And numbers on the Block and Part tabs to remind us which element we’re editing, as well as a way to advance to a different block/part without going back repeatedly to the main window? Lastly, a bug report: Piano scale picker is blank on iPhone 6 iOS 12.4.8. Thanks for this awesome sound creator and interface! Love your apps!

Musicmandisco ,

Wanna hear something different?

Then secure the best thing you’ll spend $ on today! Sounds very unique. Interface is familiar if you’ve previously purchased a VirSyn app. Presets do a pretty good job of showing off the app’s capabilities. I hit a couple of interface bugs on my 11pro, ( fractal options on bottom right if dev is reading. I would also suggest working on the ability to fly through presets but please prompt a save before changing.) So Happy to pin this one to my “Sonic Wonderland” synth folder!!!! Support iOS music production! So looking forward to getting deep into this Synth!!! Thank You!!!!

GtrGeorgeDC ,

Really Interesting!

This is a great synthesizer; it continues the really innovative approach to additive synthesis taken by Virsyn; there are some fascinating possibilities.
The one irritating feature is the wave sequencing section; it’s a very cool design, but it’s really hard to find just the right spot to make changes to the regions. But I’m getting used to it, slowly... The sequencer could also use some additions; it currently goes forward only; it would be nice to have a back & forth option, and maybe a random option.
Quite a learning curve with this one, but that’s part of the fun, for me anyway.

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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