Podcasts 2 and 3 are out, discussing character control in the 3D world and making voice over positional. Both tutorials are accompanied with respective zip files containing all the project and media files to run it on your system.
If you have missed the intro and podcast 1, you can refer to them in the link further down.
You can go to
www.oseyeris.com and click the lab page. There you have the series of podcasts available to learn how to create a fully immersive 3D audio engine.
Please leave comments if you wish to change the tutorial method, or wish to know about some swift API and I will try to fit it in with the next podcasts if they are relevant enough.
Have a great rest of weekend :)