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Fix Audio
A steady tempo for your Suno track in one click
- Drifting tempo → steady grid: the track lines up with your DAW bars
- Finds every hit with the Beat This! neural network, right on your computer
- No cheap-warp sound: attacks and transients stay crisp
- 24-bit WAV at the file's own sample rate — 44.1, 48 or 96 kHz
Free · no limits
Standalone app for Windows, macOS (Apple Silicon) and macOS (Intel). No sign-up, no keys.
four steps
From file to result
See the tempo
The app shows the tempo it found and how much it drifts. If the track can be read at two tempos, it offers the second one.
Pick the project tempo
The nearest whole BPM in one click, or your own down to a tenth. Shift the key if you like.
Press FiX
Compare Original and Flattened right in the window and save a WAV with the tempo in its file name.
what's inside
Features
A steady tempo with no loss in quality
Suno tracks and live recordings drift: hits wander tens of milliseconds off the grid. Fix Audio stretches the track smoothly, in one pass, along a map of every hit it found — no jumps or clicks at the seams.
- Signalsmith Stretch keeps the attacks crisp
- Pauses and drum-less breaks don't throw off the tempo of the whole track
- No limiter: if peaks go over 0 dBFS after stretching, the whole track gets quieter — the sound isn't distorted
A tempo that fits your DAW
The app shows the tempo it found and fits the track to the nearest whole BPM or to yours, down to 0.1 BPM.
- Result screen: "Was 124.02 BPM → now 124.00 BPM"
- If the detection methods disagree, the second option is one click away
- File name with the tempo and key: "Track_124bpm_Am.wav"
Key shifting, too
Fix Audio detects the track's key and shifts it by up to ±12 semitones in the same pass as the tempo. You can preview the shift before processing.
- Neural key detection
- "Keep the vocal timbre" — vocals without the chipmunk effect
- Instant preview of the shift right in the window
Everything stays on your computer
Analysis and processing run without the cloud or the internet: the track is never uploaded. It runs on modest Macs too.
- Windows and macOS — Apple Silicon and Intel
- A 3–4 minute track on Apple Silicon takes about 10 seconds
- The source sample rate is kept; output is 24-bit with dither
system requirements
What your computer needs
| Item | Minimum | Recommended |
|---|---|---|
| OS | Windows 10 x64; macOS 11 on Intel, macOS 12 on Apple Silicon | Windows 11, macOS 14 or later |
| WebView2 | If it's missing, the Windows installer downloads and installs it | Already included in Windows 11 |
| CPU | Any 64-bit Intel or AMD, Apple Silicon | Apple Silicon (M1 or later) or a modern 6-core CPU |
| Memory | 4 GB | 8 GB — for tracks longer than 10 minutes |
| Disk | 1 GB for the app plus room for tracks | A minute of 24-bit 48 kHz WAV is about 17 MB |
| Internet | Not required | — |
What the app doesn't do — so you don't find out after installing
- Swing and odd meters: the app pulls hits to a straight grid, so a triplet groove becomes straight
- Separate stem processing — it flattens the finished mix
- m4a files — convert them to WAV or MP3 first, for example with the free K1RO Converter
questions
Common questions
How much does it cost?
Nothing: Fix Audio is free — no sign-up, no keys and no limit on the number of tracks.
Why does a Suno track need flattening at all?
Suno generates tracks without a metronome, so the tempo drifts: hits wander tens of milliseconds away from the DAW grid. That makes it hard to drop the track into a project, add your own drums or mix it with other parts — Fix Audio puts every hit on a steady grid.
Will it hurt the sound?
The track is stretched smoothly in one pass, with no limiter and no resampling: the sample rate stays the same as the source and the output is a 24-bit WAV. If peaks go over 0 dBFS after stretching, the app turns the whole track down by just enough and tells you so in the window.
What if the tempo is detected wrong?
If the track can be read at two tempos (say, 70 and 140), the app offers the second one right away. You can also set the project tempo by hand, down to a tenth of a BPM.
macOS says it can't verify the developer
Right-click the app → Open and confirm. You only need to do this once — after that it opens as usual.
Windows says "Windows protected your PC"
That's SmartScreen: it warns about apps that few people have downloaded yet. Click More info → Run anyway — you only need to do this once.
Do I need the internet?
No. Analysis and processing run right on your computer; the track is never uploaded.
Suno is a trademark of Suno, Inc. K1RO is not affiliated with Suno, Inc. The rights to each track belong to its author.