please explain "HMT analysis" feature

As I understand it, the HMT ANALISYS feature reads the midi notes on my track and is needed to work with HTM FOLLOW.
Further the ANALYSIS feature defines what exactly? What happens if I unselect it? What if just one of ten instruments uses the ANALYSIS feature? I just don’t get it. The HMT is working on a full range finetuning, isn’t it? What do I need an analysis for?