MP3, WAV, FLAC, M4A — or click to browse
pitch stays put at any speed. Space = play/pause.
±12 semitones, independent of speed. L = toggle loop.
the player runs Signalsmith Stretch, an open-source spectral time-stretch engine, inside an AudioWorklet. it re-times the audio's spectrum instead of resampling it, so the tempo moves anywhere from 25% to 150% while every note keeps its pitch. the pitch control works the same way in reverse: ±12 semitones, independent of speed.
no. the file is decoded in-memory by the Web Audio API and played from there. this is a static page with no server to upload to, and nothing persists after you close the tab.
anything your browser can decode. WAV, AIFF, FLAC, MP3 and M4A are the safe bets.
learning music by ear. most of transcribing a solo is just hearing it slower than it was played: drop the speed to 50–75%, loop the phrase (L), and creep the speed back up as your fingers catch on. Space toggles play, so your hands can stay on the instrument.
not this one. the BPM + key detector reads a track's tempo and key; the pitch control here shifts live playback only, and pitch shift renders a moved copy as a WAV you keep.