BOWED MELODY WORKFLOW
Upload or record an isolated violin melody with one sounding pitch at a time, convert it below, compare the detected-note preview with the recording, then download the .mid file. A sustained bow stroke can contain vibrato and changing loudness; this browser tool estimates one pitch per analysis frame and does not isolate simultaneous strings or the rest of an ensemble. Inspect unexpected note splits before changing a control.
PROCESS ON THIS DEVICE
Try a short clean phrase first. Listen to the source and compare its note starts and tails with the detected notes.
INPUT MP3 / WAV / M4A / FLAC / OGG → OUTPUT .MID
or click to choose audio from your device
MP3, WAV, M4A, FLAC, or OGG · one file · up to 50 MB / 5 minutesRESULT
Your violin recording stays on your device. All processing happens in this browser. No file is uploaded to a server.
LOCAL SIGNAL TEST
A locally generated WAV contained a steady 440 Hz segment, silence, and a second 440 Hz segment with a narrow synthetic pitch wobble. At the default controls, the browser showed “1 notes · MIDI 69–69 · 120 BPM” and enabled the MIDI download. This is a controlled signal check, not a result from a real violin or an accuracy measurement.
WHAT THIS MEANS
The observed narrow wobble did not create another exported note in this test. A different recording may cross a rounded note boundary or lose a short event. Compare the source and preview before changing settings.
START WITH THE SOURCE
Record a short solo phrase without accompaniment. If a double stop or another instrument overlaps it, the detector still returns one pitch estimate per analysis frame. Use an isolated part, not a full mix, when you need a single violin line.
COMPARE THE RESULT
Replay one sustained note and mark where its vibrato, bow change, and release occur. Compare those moments with the piano-roll blocks. A block boundary inside one continuous note is a different symptom from a missing soft note at its end.
| What the preview shows | Listen for | Change one thing | Keep only if |
|---|---|---|---|
| One held note breaks into nearby pitches | Wide vibrato or a pitch slide during the sustain | First try a steadier recording of the same phrase | The intended pitch remains without false block changes |
| Brief extra block at a bow reversal | Scrape or unstable onset at the bow change | With the same file, raise Minimum note one step | The brief block disappears but real short notes stay |
| Soft ending disappears | A quiet but audible note release | With the same file, lower Silence threshold one step | The ending returns without room noise becoming notes |
| Several simultaneous strings collapse into one line | A double stop or another instrument | Isolate a single-pitch violin line before conversion | The source has one intended pitch at a time |
| A real high note is missing | Whether its pitch lies outside the current window | Widen only the relevant Pitch range edge | The note appears without unrelated high-frequency blocks |
WHY SPLITS HAPPEN
The shared code detects a frequency in each frame, converts it to a rounded MIDI note, smooths neighboring frames, and groups consecutive frames with the same MIDI note. A sustained pitch that moves far enough across a note boundary can appear as multiple blocks. This is a code-level explanation, not a promise about every recording.
CONTROL BOUNDARIES
Minimum note removes short detected events. Silence threshold filters quiet frames. Neither setting separates simultaneous violin pitches or corrects a bowed slide. Try the control that matches the visible symptom and keep the change only when an intended note survives.
QUICK ANSWERS
Yes, when the source is a clean single-note violin melody. Upload or record it, inspect the browser-generated preview, and download the .mid file.
No universal result is claimed. Compare a held note in your recording with its preview. The code rounds each detected frame to a MIDI pitch, so sufficiently large pitch movement may cross a note boundary and split a block.
No. It estimates one pitch per frame. Isolate separate parts before conversion if you need separate lines.
Check loudness first. Minimum note filters short events; the Silence threshold controls whether quiet frames are considered. Lower the threshold one step and keep it only if the intended tail returns without extra noise events.
No. The audio is decoded and analyzed in your browser; the file is not sent to a server.