Maybe add an "About" page that explains what this is and how/why it was created? I hit "Sample Song" and it took me a minute to figure out what was going on --

Maybe add an "About" page that explains what this is and how/why it was created? I hit "Sample Song" and it took me a minute to figure out what was going on -- that you're supposed to select a sampling frequency and then it displays the waveform. Speaking of which, maybe put the "Frequency of Sample" selector above the buttons rather than off in the corner?