The 66music tool bench
66loops
Upload any recording and loop any section of it to jam along — everything stays in your browser. The analysis tells you what it hears (bars, silences, rhythm) with its confidence, and transcribes single-line phrases to a MIDI file you can take anywhere. What it cannot honestly do — untangle chords into notes — it says plainly instead of guessing.
any audio file — it never leaves your browser
upload something to begin
speed affects pitch here — uploads have no known period
single lines only — bass riffs, one-note-at-a-time guitar or keys, up to 12s of the loop. Polyphonic transcription needs trained models this tool won't pretend to have.
your browser saves to its Downloads folder — a default folder needs Chrome or Edge
no saved loops yet — set a loop and press Save. Saved loops live in this browser (Safari may clear browser storage after ~7 days away — download or use a folder for keeps).