Spent most of the day learning the Nyquist theorem ,the wild part is that sampling too slow doesn’t just lose data, it actively lies to u and reports a completely different, wrong frequency (called aliasing). Built a chirp generator that sweeps 18-20kHz, just under the inaudible to adults line, and burned an embarrassing amount of time debugging why I heard nothing before realizing it was a audio routing issue, not the DSP. Speakers confirmed working with a loud 440Hz test tone. On to recording and the FFT next.