I've written a script called filter_diffs which displays the differences between the loaded filter file and the one in the chans/ directory (which is pending loading). The differences are shown side-by-side in a Vim session, which allows you to move up and down within the files. The details of the line differences are color coded.
To run the script:
filter_diffs MODEL_NAME
Attached is the output from running
filter_diffs h1susitmy
(It looks like foton has reordered the MODULES list and removed the spurious data_rate line)
Remember, to close all windows and exit Vim, type :qa
If, when vim is starting, you get the message:
Press ENTER or type command to continue
this can be fixed by editing your ~/.vimrc file and changing 'set syntax' to 'syntax on' (or entering the latter if you have no syntax directive)