Couldn't find anything on the Mutable forum on this. I checked the firmware version on my module which is V4.1 which I think is the Bees in the Trees mod. I found an article about this hacked version and this extract refers to fine tuning.
" there are no new capabilities provided except that fine tune no long shares a CV channel with FM, and thus the FTUN setting in Bees-in-the-Trees is not really needed with the new version of Braids (so just ignore it!)."
I don't really understand that statement. It's saying the FTUN setting no longer needed but I guess the fine knob should still work but presumably you don't need to adjust it's settings. These seem to be the range in which the knob works and not whether it is enabled or not. I know I did get it working a while back but have rarely used it since but now I have more VCO's in my rack I want to be able to fine tune it to match them.