Show HN: Nevertwenty a novel approach to chord synthesishttps://www.nevertwenty.com
I play piano and I built this for myself recently. Type a song, hit play, and the chords come at you on the beat. It's Rock Band for real instruments: the chord you need is the one under the playhead. I've almost got the entire music database here. I dare you to find a public track that isn't in here. Catalog is 6.8M songs / 103k artists. Librosa beat detection. ONNX graph combined with my custom tuned BTC. Bass notes processed independently. Median over 4536 cold runs: 2.15s to decode, 122x realtime. Download is the slow part at 8.4s median. Moving the audio is the bottleneck. MP3 search is…