What are the limitations and drawbacks of diffusing with the AudioBox?
The AudioBox, or more correctly, ABControl, uses a relatively simple equal-power panning scheme to create stereo phantom-images. Otherwise, it relies on discrete channels being sent to individual speakers. This is vastly preferable to most surround sound or soundfield approaches for the majority of electroacoustic music. Research into the psychoacoustics of localization, however, suggests many additional techniques that could be incorporated, some of which are well-studied (global reverberation vs. local reverberation, and Doppler shift, to name two). ABControl doesn’t provide any explicit support for these localization techniques. On the other hand, it doesn’t prohibit you from implementing them separately, as a pre- or post-process.