The upcoming iOS 9 update seems to have some exciting features for us musicians. The first one is multitasking which will allow us to use two apps at the same time. This is going to be quite useful if you want to control two synth apps at the same time, or if you want to record a synth app in a DAW app.

I was already quite excited about that one, but I just discovered an Apple demo code for another feature, which might render this usage of multitasking useless again.

I'm talking about Audio Unit extensions. There had been some rumors about that since Monday (the start of the WWDC). The iOS 9 change log says:

The Audio Unit extension point allows your app to provide musical instruments, audio effects, sound generators, and more for use within apps like GarageBand, Logic, and other Audio Unit host apps. The extension …