Voice Synth was updated with Inter-App Audio support. The app can operate as input/effect as well as the host for Inter-App Audio enabled apps.
Voice Synth – app for re-synthesizing your voice and creative processing that allows to transform sound of voice in to the different music instruments. Sample your voice and process it with built-in effects like vocoders, pitch shifters, formant filters, delays, distortions etc. And with auto-pitch function your voice will always be in tune.$8.99