After contacting the developer, a text file calibrating the contour of the feeble cell phone microphone is forthcoming in a new release of this fine software. Until such a time that this new version becomes available, my search is on for a suitable or temporary substitute. In other words, I can no longer use the cell phone app to tweak the crossover network until I am confident that what it tells me is actually what I am hearing. But work in areas other than this can continue.
See also Part 1, Part 2, and Part 3