Writing DSP audio plug-ins.

Hi, I’m really interested in writing audio plug-ins.
I see from Unity YouTube vids that it’s now possible to write a native plug-in and have it run with a Unity GUI.
I guess my ‘native’ it means that a library or DLL is made in C or C++ and compiled for the intended platform for speed, then linked with the unity editor?

It all sounds really great and I’m very keen to get started, where can I get any more information on writing these?
Cheers,
Dave.

Anyone?
I’ve read this:-
http://blogs.unity3d.com/2014/07/24/mixing-sweet-beats-in-unity-5-0/
But it doesn’t really tell me how to do it, it just tells me I can.

Does Unity5 support to build my own audio effect plugin?

Custom FX are already available with Unity 4. Audial Manipulators for instance: Unity Asset Store - The Best Assets for Game Making