This uses numpy.correlate to find the fundamental frequency of the selected analog range.
Autocorrelation is not ideal for all fundamental frequency calculations.
Since I couldn't remember how to perform the calculation from my college days, the extra math was taken from here.
This analog measurement extension will look like this:
For details on the specific calculation used, please browse the repository source.
This measurement is too slow for long sections of data. For larger sections, I recommend exporting the analog channel to CSV, and processing the data in python or another tool.