Amazing. I find very fascinating the concept of emulating a slower purpose-built processor within the instructions of a faster general-purpose CPU.
There must have been quite a lot of reverse-engineering in devising/guessing which specific ROM-level signal processing routines have been used by Access, in their specific implementation of the DSP kernel macros available for the chosen Motorola processor.
The programming aesthetics in reproducing DSP nuclei as adaptive real-time bits of code and related CPU processes is very elegant. 
