[RMX] Harmonizer Question

I’ve been trying to experiment with the RMX Harmonizer and I find that it very rarely, if ever, moves or adjusts any of my points. I’m just wondering if there’s anything I’m missing concerning getting the most out of it.
Like do I need to input more information in the Font Into panel (vertical stems, horizontal stems, etc.)?
Does it tend to work better on lighter weight letters?
Do I need multiple masters?
I realize it’s not some magical thing that transforms your letters into perfect shapes, but I was just wondering if anyone had some advice on getting the most out of that particular tool?