Well the AD1955 eval board uses the PDIP version of AD797, so I think it must be the ANZ version. See attached picture.
I think the AD827SQ would be better as I/V converter opamp due to the much faster settling time and larger slewrate (300V/us vs. 20 V/us of AD797 vs. 9V/us...
Detailed pics and more info on Essence III
I found this website with some detailed info about the new Asus Essence III. hit translate in Chrome :)
Looks like there is some volumen adjustment potentiometers on the back for XLR levels ?
and a switch that says VR bypass (Volumen...