FIR compiler II parameter settings for sample rates below 1Mhz

Once I came to understand that the filter taps need to be determined for the output of the interpolation stage everything started to make sense. That particular bit isn't spelled out anywhere in the documentation. The matlab model was also helpful to get a handle on the operation of the filter. Inspecting the matlab model makes it clear that the filter is applied afte interpolation, and the final decimation is just subsampling, which assumes any aliasing issues have already been addressed by the filter cutoff frequency that preceded.