iPad Screenshots


Full manual available at the Audio Damage website.

Phosphor is an unique instrument modeled on the alphaSyntauri, a vintage digital additive synth from the early 80s. The original alphaSyntauri required an Apple //e to operate, but we've gone ahead and eliminated the middle-man, and now you can have this classic digital synth in your iOS device, no 5.25" floppy drive necessary!

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.

• XML preset system, with copy-to-clipboard, for sharing presets in forums and with your friends.

• AudioUnits V3 version for use in all AUv3 hosts, like AudioBus 3, AUM, BeatMaker 3, Cubasis 2, GarageBand, etc.

• Standalone version (with full single-panel UI) with Inter-App Audio and BlueTooth MIDI capability.

• iPhone version coming soon!

Ratings and Reviews

4 out of 5

13 Ratings

13 Ratings

Sounds nice, but the interface hard to touch

Korg Fan

Someone else was right: It is really hard to move certain buttons and envelope coordinates on at least an iPad Air 2. It sounds interesting and modern, but there’s nothing it can do that the PPG apps can’t do except for an interesting delay feature. Also, it doesn’t alias as much as WaveGenerator (only by half an octave or full octave). You know what else can have additive oscillators modulate each other? PPG WaveGenerator! Unless I get an update, I might as well refund for now.

Vintage Fun and a steal of a deal!

Film less Soundtracks

When you begin writing your own presets before you even play any of the Factory presets, enough said! This will go up in price I have no doubt. Get it while it's cheap. Five stars, easily! Thank you to the manufacturer.

No sound, no manual, no email address


I opened the app and tapped the keyboard, no sound. I looked for the manual at the Audio Damage web site, the site doesn’t list Phosphor 2 as a product. I tried to email support, but it requires me to reinstall the Mail app which I will not do. Useless app which the developer does not support.


Audio Damage, Inc.
8.7 MB
Requires iOS 9.3 or later. Compatible with iPad.
Age Rating
Rated 4+
© 2011 - 2017 Audio Damage, Inc. All Rights Reserved


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like