csSpectral

csSpectral is a real-time, Csound-based, multi-effects processor featuring a Streaming Phase Vocoder and six other FFT-based spectral algorithms. The diverse collection of real-time DSP effects let you create unique textures and timbres by transforming your voice, your instrument, imported audio, or songs from your iTunes library. csSpectral also supports Audiobus, allowing you to send and receive audio from other apps, making the processing possibilities nearly endless.

Version 1.1.1 release notes

This app has been updated by Apple to use the latest Apple signing certificate. - Audiobus updates - Dropbox fixes - Various fixes and updates -------------------------- - Full 64 bit support. - AudioBus 3 support. - Updated DropBox support.