What we tested
We generated one mono WAV file at 22,050 Hz with four isolated sine tones: A0 at 27.5 Hz, E1 at 41.203 Hz, A1 at 55 Hz, and C2 at 65.406 Hz. Each tone lasted 0.9 seconds, with 0.35 seconds of silence between tones. No public recording, video, performer, or channel was used.
The file went through the local YouTube-to-MIDI converter at its default sensitivity and minimum-note-length controls. The browser completed without console errors and exported a 293-byte MIDI file.
| Input tone | Expected MIDI | Exported pitch | Exported fragments |
|---|---|---|---|
| A0 · 27.5 Hz | 21 | A♯0 · 22 | 6 |
| E1 · 41.203 Hz | 28 | E1 · 28 | 7 |
| A1 · 55 Hz | 33 | A1 · 33 | 8 |
| C2 · 65.406 Hz | 36 | C2 · 36 | 8 |
What the result means
The converter reached into the low register, but the output was not a clean one-note-per-tone transcription. Three input pitches were named correctly while the lowest tone moved up one semitone. Every steady tone was divided into short adjacent events rather than one continuous note.
That makes the result useful as evidence of where a bass note occurs, not as a finished bass line. A piano-roll check should cover both pitch and continuity before the MIDI drives another instrument.
Why low notes are difficult to transcribe
Low frequencies complete fewer cycles in the same amount of time than higher notes. Real bass recordings also add harmonics, speaker coloration, room noise, compression, and overlapping kick energy. Those factors can make the fundamental pitch less obvious than this clean sine-wave test.
How to clean a low-register draft
- Solo the bass audio if you can. A cleaner source makes the low fundamental easier to compare with the MIDI.
- Check the octave and semitone. Audition suspicious notes against the source before fixing timing.
- Join fragments that belong to one held tone. Preserve a gap only when the source has a real re-attack.
- Listen on suitable playback. Small speakers may hide the lowest fundamental, so use headphones or monitors that reproduce the range.
What this test proves—and what it does not
It records the exact output for four generated low sine tones in the current converter. It does not establish a universal lower limit, compare musical instruments, or predict results for bass guitar, piano, synthesizer, vocals, drums, or a dense mix.
For general short-fragment cleanup, use the extra-note guide. If a bass part is mixed with other instruments, read the track-separation test. For repeated attacks, see the repeated-note test.