I have recently prototyped a sound spatialisation tool using MaxMSP as part of a university project. It allows you to load a sound and animate it, along with a virtual microphone, using jitter. Doppler shift, surround panning, amplitude and high frequency attenuation, and reverb are added based on the relative positions and 3d "world size" . It's not quite finished yet so some of the UI elements are redundant and it is far from optimised, but I would be grateful if I could get some feedback on the idea, interface design, sound quality etc. It's my fourth real go at a MaxMSP project and I've learnt a lot (and run into many problems!) in the process.
Here's a link to the .app (Mac only) if anyone wants to try it out: