Hi haymiggan
i've found an old review/interview of Index Access (on an 1997 italian magazine)
So . . .the in-built audio digitizer, works throug the parallel port and must be activated, from a "special custom register" (due the fact of printing OR digitazing).
Ask to M. Tretene maybe he has the answer.
Ciao
PS- all the above infos, are related to an "Acess R1.2/Pre-prod #03" so could be ancient.