The Honda crossover growl. Normal when healthy. The tuner knows the difference.
Nothing. This is the cam profile switching on purpose at higher revs.
Enjoy it. If it sounds harsh or comes with a warning light, record it and let the app listen.
Reading about sounds only goes so far. The tuner on our home page listens in your browser and tells you what it hears. The app goes further: it names the exact fault, checks it against your vehicle, and tells you how urgent it is.