This is big news for developers, and great news for users! The Amazing Audio Engine is designed to make all the deep bits in music app development easier to implement, and includes features users want; such as Audiobus!
iOS Core Audio is pretty amazing, but can be tricky to work with. This is why we see such long development cycles on some apps, including lengthy waits for bug fixes. The vast majority of developers are doing apps in their spare time. AAE will save them time, and headaches by handling the heavy lifting.
"Built upon the efficient and low-latency Core Audio Remote IO system, and written by one of the pioneers of iOS audio development and developer of Audiobus, Michael Tyson, The Amazing Audio Engine lets you get to work on making your app great instead of reinventing the wheel."
Best of all the Amazing Audio Engine is free and open! Anyone and everyone can immediately use it or hack it!