#1 That's it
#3 Nice
#2
I'm learning about acoustics. Take my view on this with a grain of salt
It's important to pay attention to modes that are alone or are too close. The hertz log scale would serve to have a better visualization on how far are the modes are from each other.
I don't see any use for the sequential mode numbering that the aplication offers. I also noticed that you present different modes at the same frequency with separate bars next to each other, ex: in a room (4x4x3 meters), I've got different modes at the same frequency: 43, 61, 172, 214, 275,286. There's no quick way of detecting this, I have to hover