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App History

Jul 19, 2021
Jun 10, 2021
Apr 05, 2021
Mar 19, 2021
Version 1.3.1
Jan 29, 2021
Version 1.3.0
Jan 26, 2021
Jan 11, 2021
Version 1.2.1
Dec 21, 2020
Dec 18, 2020
Dec 01, 2020
Nov 20, 2020
Version 1.2.0
Nov 18, 2020
Oct 21, 2020
Version 1.1.0
Sep 06, 2020
Version 1.0.3
Sep 05, 2020
Version 1.0.2
Aug 31, 2020
New App: $8.99, v1.0.2
Aug 26, 2020

Other apps by Harry Gohs

App Store Description:

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 in v1.3.1

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

iPad Screenshots:

iPhone Screenshots:

On one hand, there are lots aspects of this synth that I'd call clunky. And the manual is also clunky. On the other hand, holy moly, this synth is amazing! Deep and Wide!

It provides rich additive synthesis with level, pitch, pan, attack, decay; all per partial. Unfortunately, the control when editing (for) partials is very limited. Rather, you can get an overall shape, and you can tweak odds and evens separately. But the ability to get very granular is just not there. No zooming (except for vertical zoom with frequency offset).

It also provides a filter that you can shape by drawing across the spectrum. This means you can emulate lots of different tonal qualities. The filter modulation smoothly shifts this shape across the spectrum. It's not clear how the morphing between blocks will work, but I expect it will be smooth and useful.

A separate noise section provides a very customizable noise shape that also tracks the attack & decay settings per frequency slice. This is actually quite powerful for attack transients and very specific kinds of resonance.

At a more macro level, you have four voices ("parts"), so you can layer things. And you have 8 blocks per part-- so you can do something akin to wavetable motion that morphs between settings of 8 different additive/filter/noise profiles.

It's a little clunky to move around the interface. Envelopes that control amp & pitch are flat vector ADDSR, so no curves, no additional break points. I didn't see anything like a MIDI learn or mod matrix. There are a couple places where you can modulate things with a selectable MIDI source. The manual says you're controlling the LFO rate, but it is actually depth not rate.

The bottom line is that this is a ridiculously flexible synth. It could almost be a "desert island" synth in that you could do so many different kinds of sounds with it.

I wish it could zoom to edit partials. I wish the envelopes had more breakpoints or curves. I wish there were more MIDI modulation options. But all that said, they made some smart choices and this will give us quite a bit to explore!
September 03, 2020  | favorite_border stub

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