Hmmm, good luck with getting that
On a serious note, if you are doing a dissertation on this technology I assume you have knowledge of DSP circuit design for audio applications?? What I would do is get the reference designs for the DSP chips, A/D & D/A converters, etc. from the manufacturers and put them together - they are freely available. I think you'll find that if you had the axefx (or dare I say, HD500) schematic, the core electronic blocks would not look very different from the reference designs. The low/high level circuit design is not necessarily novel - designers put blocks together ensuring they play well together. Using excellent components, good board layout, techniques, etc. in combination with intelligent firmware is what makes this device novel and awesome... but you probably know that. Good luck on your dissertation!