Yes, there will be nothing recorded on the FDR. This is why the analysis of sounds recorded by the VCR will be a part of the test flight, but outside parties involved no one really know exactly what will be the extent of the experiment.
Regarding VCR tape analysis, there were 3 separate teams working on them, and I wonder, what will be the final findings.
Newertheless, most of the missing answers are in my opinion to be found in the regiment itself.
Arrakis