Today, I've come to announce that bindings that works for both macOS and iOS have been done, which is soon to be integrated with Hipreme Engine
Those bindings are on AVAudioEngine Bindings Dub.
They depend on a new dependency I've also put on dub, which is a base for Creating Objective-C Bindings
On the AVAudioEngine repository, there is a simple script I made with Javascript for converting partially an Objective-C file to D, which helped me assembling those bindings.