I've been using SPLnFFT for a while now, with consistent results and I'm happy to see a formal evaluation. The problem that remains is that there are differenc

I've been using SPLnFFT for a while now, with consistent results and I'm happy to see a formal evaluation. The problem that remains is that there are differences in microphones between iOS devices. SPLnFFT author should probably calibrate the app on every device that is out there on the market. I'm not sure if that's at all feasible.