Phosphor 3 4+

Vintage Digital Synthesizer

Audio Damage, Inc.

    • 4.9 • 7 Ratings
    • $5.99

iPad Screenshots


Phosphor 3 is the latest version of our Phosphor series of vintage digital synthesizers.

Phosphor is a clone of the alphaSyntauri, one of the first relatively inexpensive digital synthesizers, that ran on the Apple II. Phosphor is a faithful recreation of the alphaSyntauri's additive synthesis engine, and can accurately recreate the sound of this classic and groundbreaking synth.

The Phosphor 3 update brings MPE, tuning tables, extensive modulation, a new preset manager, and an all-new reactive UI to the plugin.

Featuring two additive oscillators (with the original 16 partial complement of the alphaSyntauri, or optionally with 32 or 64 partials), each with its own amp envelope, Phosphor's topology closely follows the alphaSyntauri, while adding many modern features such as full velocity control, a much more extensive modulation routing system, tempo synced LFOs, a pair of delays, and two monophonic modes. The noise and oscillators are able to work in the original alphaSyntauri "low-resolution" modes, or can be run in modern high-resolutions. Phosphor can accurately model the original sounds of the alphaSyntauri, yet still provide new paths for sonic exploration.


• Two complete oscillator/envelope sections modeled on the original topology of the alphaSyntauri.

• Each set of partials can run in "lo-fi" mode, emulating the gritty digital voicing of original, or in a modern mode for alias-free sines.

• The noise can be either "lo-fi" digital shift-register noise per the original, or modern white noise.

• Two complete delay sections with LP/HP filtering and cross-feedback.

• Two tempo-syncable LFOs with multiple modulation destinations.

• A large complement of presets included that show off the extensive sound generating capabilities of Phosphor, including some famous alphaSyntauri presets directly ported from the original.

• TUN file loading for alternate tuning and scales.

• MPE (MIDI Polyphonic Expression) capability for MPE controllers like the Roli Seaboard, Linnstrument, and Sensel Morph.

What’s New

Version 3.1.6

Just a maintenance update, to make sure everything is current.

Ratings and Reviews

4.9 out of 5
7 Ratings

7 Ratings

kk100 ,

Capable and Amazing!

I don’t know how long I’ve owned this synth but I just got around to playing it and wow, it’s fun! It has a unique feature which I’ve only seen on Copperhead by 4Pockets; it allows you to design your wave by setting the fundamentals! This is a big deal. You can learn a lot about audio waves just by observing the effect the fundamentals have in the wave shape.
Too bad there’s no oscilloscope to show the effect but there’s several on the App Store you can attach to via your DAW via auV3.
This is a great synth… just get it!!

JohnFBP ,

Weird little synth

Very versatile noise maker. Just scratching the surface of this but I can tell it’s deep. Worth the $

VC1017 ,

Frequent crashes when rotating presets

After running through a number of presets, this synth will crash. I’ve been able to replicate this bug 4 times in the last 10 minutes of trying it out.

Edit: This bug may have been patched. There was a recent update but no update log. Before the app would crash at about 20-30 patch cycling. Now it's more like 100-150 when changing patches very quickly. Thank you.

App Privacy

The developer, Audio Damage, Inc., 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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