Very good FFT analysis

I frequently (no pun intended) use this app to show my grandkids how the piano and bell notes work. It works very well.

I would like to have a gain adjustment since the waveforms often exceed the display height so you cant see the shape of the waveform. It would be great if you could set "keep waveform within display" that adjusted the gain to keep the waveform peaks on the display. As it dies out, it could get smaller than full scale.

OlderGuy2 about FreqCounter