CONTROLLED COMPARISON

How to Compare Audio-to-MIDI Results

Use the same source and passage, save a baseline, change one control, and compare the visible note count, MIDI range, piano-roll pattern, and the same preview passage. Keep the trial only when the intended melody remains and a specific unwanted symptom is reduced.

Same source: keep the input fixed
One change: isolate the control
Visible signals: count, range, roll, preview
Keep or revert: use a stated stop rule

Controlled audio-to-MIDI comparison using one source, a baseline, one control change, and a keep-or-revert decision — A controlled comparison explains what caused a visible change; an unsupported accuracy label does not.

RUN THE TEST

Make a baseline conversion

Use one supported file, record the result summary, then change one control only.

INPUT MP3 / WAV / M4A / FLAC / OGG → OUTPUT .MID

Drop one comparison file here

or click to choose audio from your device

Choose audioMP3, WAV, M4A, FLAC, or OGG · one file · up to 50 MB / 5 minutes

Or capture one clear melody with your microphone.

Your audio stays on your device. All processing happens in this browser. No file is uploaded to a server.

No sign-upOne file at a timeNo watermark

Single control changed	What can visibly change here	What does not prove improvement	Keep the trial only when
Silence threshold	Detected note count, quiet-event presence, and piano-roll pattern can change.	A lower note count by itself.	The intended melody remains while the targeted quiet false events are reduced.
Low or high pitch boundary	The displayed MIDI range and out-of-band events can change.	A narrower range by itself.	Unwanted edge detections disappear without removing intended edge notes.
Minimum note duration	Brief fragments can disappear and the note count can fall.	Fewer notes by itself.	Targeted fragments are reduced while intentional short notes remain.
Tempo	The displayed BPM and downloaded MIDI timing scale change.	An unchanged piano-roll preview.	The downloaded file aligns more usefully with the intended project timing.
Quantize	Downloaded MIDI event timing snaps to the selected grid.	An unchanged on-page detection preview.	The downloaded timing is easier to edit without erasing intended rhythmic placement.

Decision map comparing intended melody, targeted symptom, and unintended losses before keeping or reverting a trial — Record a reason for the decision: what stayed, what improved, and what new loss appeared.

BASELINE

Record what the page actually shows

Write down the control values, note count, displayed MIDI range, BPM, and a short description of the same preview passage. These are observable signals, not an accuracy percentage.

TRIAL

Change exactly one variable

Keep the file and passage fixed. If two controls change, the result cannot tell you which control caused the difference.

REFERENCE

Use known intended notes when available

If you have a score, a played note list, or a hand-checked reference MIDI, compare detected events with that reference. Without one, describe visible symptoms and avoid calling the result accurate.

DECISION

Keep a trial for a named reason

Keep the change only when the intended melody remains and the exact symptom you targeted is reduced. Revert if an intended note, boundary, or rhythm disappears.

QUICK ANSWERS

Audio-to-MIDI comparison questions

What is the most accurate audio-to-MIDI converter?

An accuracy claim cannot be verified from a product label alone. Use the same source and a known reference transcription, define which note and timing differences count, then compare the outputs under the same conditions.

How can I compare two audio-to-MIDI conversions?

Hold the source fixed, save a baseline, change one control, and compare note count, MIDI range, the same piano-roll passage, and the same audio preview before deciding.

Does fewer detected notes mean a better result?

No. A lower count may remove false fragments, but it may also remove intentional short notes. Check which specific events disappeared.

Why did quantize not change the on-page piano roll?

On this tool, quantize is applied when the MIDI event timing is written to the downloaded file. The on-page roll displays detected notes, so compare quantized timing after importing the download into a DAW.

What should I change first?

Match the visible symptom to the troubleshooting table. Change its first suggested control, then compare against the unchanged baseline.

Download the conversion comparison template (.csv)