As far as I see this is basically naive TDHS (Time Domain Harmonic Scaling). It's a great starter project as an intro to audio-effect coding, since you can visu

As far as I see this is basically naive TDHS (Time Domain Harmonic Scaling). It's a great starter project as an intro to audio-effect coding, since you can visually observe where you go wrong and where the noise comes from at the edges. Just great for learning how audio works for beginners. It's very rare to have an audio effects algorithm so cool and so easy to observe without special analysis tools. Some more famous algorithms that work this way and are similarly easy to implement are TDHS and PSOLA. They all work in the time domain but find different ways to smooth out the discontinuities and to make more extreme shifts sound better.