My guess is that it's not a very interesting problem because it's not particularly difficult to add spatial dimensions to arbitrary audio - after all, it is alr

My guess is that it's not a very interesting problem because it's not particularly difficult to add spatial dimensions to arbitrary audio - after all, it is already commonly done in video games. All you have to do is manipulate the multichannel outputs with an understanding of the spatial positioning of each channel's speaker location relative to the listener and some basic trig.