This is so awesome. I tried to write something like this in 2007 (I called it "Tweeter") but the state of embedded hardware for makers back then was a bit more

This is so awesome. I tried to write something like this in 2007 (I called it "Tweeter") but the state of embedded hardware for makers back then was a bit more challenging so it was all PC based. I tried simple spectrogram correlation by sliding a window and comparing low-precision spectra, but I don't know enough about DSP so it never worked. Glad to see it is finally a reality.