Some advanced converters will actually generate a score or sheet music alongside the MIDI file.
The core of the conversion relies on the Fast Fourier Transform (FFT) , which converts the time-domain signal into a frequency-domain spectrum. The algorithm scans each short window of time (e.g., 23ms), identifies the loudest frequency peak, and maps that frequency to the nearest MIDI note number. This works perfectly for a solo trumpet or a vocal line. However, for polyphonic music (most popular songs), the algorithm suffers from masking : a loud snare drum or bass guitar will overwhelm the fundamental frequencies of a quieter guitar chord. The result is not a transcription but a chaotic "ghost" track that jumps erratically between the dominant frequencies.
Export and editing UX
Best for complex songs, transcribing full bands, or editing the notes.
