No way to ask a question if you don't have a Facebook account – SPLnFFT Noise Meter Review

I just purchased SPLnFFT and like the application a lot. Problem is I don't know what the 'db, db(A), db(B), db(C) & 468 is or does and there isn't any explination. I do not want and have never had a Facebook account. Without an email address or website where someone can ask a question makes the application very limited with no support. That is something I don't like at all. I would give the application 5 stars if I could contact someone but I can't. Because of that I'm giving it only 3.
Review by Dan Y on SPLnFFT Noise Meter.