Hello Leo,
In order to allow a Sub Coupler to extend below the normal manual compass you need to change the following:
MIDINoteNumOfFirstMappedDivisionKey = 36
to
MIDINoteNumOfFirstMappedDivisionKey = 24
The enclosure error just means that your frequency settings are incorrect and that one cannot be higher than the other according to where you placed them in the open/closed states.
Have a look at the example St. Anne's CODM files and you can try using those filter settings as a basis to go by.
I hope that helps.