Hi JJB,
The ADAU1772 has two coefficient memory banks (A and B) for the filters used in the signal flow you create in SigmaStudio. Utilizing this feature along with the Multi-Purpose (MP) pins you could create the system you are referring to. A few of the MP pins can be assigned to toggle between the coefficient banks. You could create your schematic, load different filter settings into each coefficient bank, and connect a switch to the MP pin assigned to select bank A or B. This is limited to two different filter settings, but if you need more, you would only need 2 EEPROMS for 4 filters, for example.
More information on the MP pins can be found on page 44 of the datasheet.
Also, here is a document describing how to create an EEPROM image using different coefficients in each bank.
http://ez.analog.com/docs/DOC-3103
Regards,
-BillJ