Here's what's new in Music IO: Audio and MIDI over USB:
Version 1.10 brings audio over USB! With Inter-App Audio support built in, you can host synthesizer and effect apps within Music IO, and send the audio to a Mac with amazingly low latency. All audio data is transmitted in 32-bit floating point, so there's no degradation of sound; what your Mac receives is crystal clear.
Music IO integrates both audio and bi-directional MIDI functionality into a single app. It's simple, easy-to-use, and better yet: one app means less processing and memory demands on your iOS device. This lets you use more instruments, create more complicated sounds, and add more (and more sophisticated) effects.