This is an old revision of the document!
SunVox
From the App Store: “SunVox is one of the most powerful music creation tools for iOS. It is a small and fast cross-platform modular synthesizer with pattern based sequencer (tracker).”
It can be run as both an AUv3 and IAA app. As an IAA app, it can be used as an audio effect.
SunVox can be used with or without its built-in tracker (sequencer) as a modular synthesizer and custom effects unit.
App type: App and AUv3
App store link: 
Developer: Alexander Zolotov
Developer AB Forum Handle:
Videos
- SolarLune Video Tutorials - extensive tutorial series for SunVox
espiegel123