I leave my biweekly gel manicure to the pros. I love watching the manicurists create tiny works of art on my nails, especially since it’s a skill I could never replicate at home. But a DIY pedicure?

Spectra analyzes incoming audio in real-time using 8-band multiband analysis — detecting onsets, frequency content, and noise-vs-tonal ratio per band — then excites a bank of musically-tuned resonant ...