to be more precise: my keys were: [HKEY_LOCAL_MACHINE\Software\ASIO] [HKEY_LOCAL_MACHINE\Software\ASIO\ASIO EWS88 MT] "CLSID"="{6D184901-04CA-11d4-8398-0800096F616B}" "Description"="ASIO EWS88 MT" [HKEY_LOCAL_MACHINE\Software\ASIO\Asio US-428 (24)] "CLSID"="{52018AC6-7D1E-11D3-8765-D0A652C10A0B}" "Description"="ASIO US-428 (24 bit)"