BTW - last night I tested for proper alignment of audio files (i.e. record latency compensation).
While my Roland interfaces were always spot on (i.e. did not require a manual offset), I had to apply +82 samples offset (@96kHz) to obtain proper alignment - anyone else seen that?
The required offset seems to be constant across different ASIO buffer settings, so it is fine to define once and leave it (see "Sonar Preferences / Sync and Caching / Manual Offset" at bottom of tab, set to +82, keep "Use ASIO Reported Latency" checked")
However, there is one potential pitfall: If you change the number of channels on the AVB to be sent from/to the computer, the interface name in Sonar changes (as it contains the number of I/O in the name). Hence, you will have to remember to redefine this in case you change the AVB to use more/fewer channels.