Hi Marianne,
Auditing DSN 32 bit settings are not in CMC.
In the BO server find the ODBC for 32 bit and create a DSN by the same name as a 64 bit ODBC DSN.
click on start menu and then navigate to administrative tools then you will find options "ODBC Data Sources (32-bit) and (64-bit).
Select the ODBC Data Source 32-bit and create a system DSN with the same name as you created a 64-bit Audit DSN.
Regards,
kailash kadam.