Why is my Serato BPM wrong (half/double time)

Serato DJ can analyze a track at half or double the tempo you count. Set the BPM range, re-analyze, edit or tap the BPM, and lock it.

A track you count around 140 can show 70. That is Serato's own example of a half or double BPM. The same scale error is what you are seeing when drum & bass you count near 174 shows near 87, or when hip hop you count near 90 shows near 180. The file has not been replaced. The analyzer calculated the other multiple.

Count a bar. If the library number is about half or about double that count, change the scale. Serato spaces the bar markers from the BPM. When that BPM is right, the beatgrid page says the markers fall on the beats, and sync needs the grid to be right.

These steps are the ones on Serato's DJ Pro and DJ Lite pages.

Set a BPM range that contains the tempo you count

BPM Range sets the upper and lower limits used while files are analyzed. Serato says the right range avoids half or double BPM values when Set Beatgrid/BPM is on. Tracks analyzed at 140 that you want at 70: choose 68-135. If a BPM looks wrong, check BPM Range in the Offline Player.

In Serato DJ Pro the Offline Player is the screen with no primary hardware connected. Set the range in Analysis Settings there. Turn on Analyze BPM / Beatgrid at the same time. The Pro page also calls that option Set Beatgrid/BPM. Serato DJ Lite has the same BPM Range control, and its page says to check it in Practice mode. The preparing article calls it the BPM Range drop down.

68-135 is the only range those pages name. This guide does not list other labels from the menu. Open the drop down and choose the range that contains the tempo you count.

Serato describes the control as a limit. 68-135 stops at 135. A count near 174 sits above that limit, and half of it sits inside the range, so a fast track can be stored slow while that range is selected. Use 68-135 when you want the slow reading, as in the 140-to-70 example. When you want the fast number kept, pick a range whose limits include it.

Loading a track to a deck is not a re-analyze. An unanalyzed track follows the Analyze Files rules. A track that was already analyzed, and still has no BPM, does not gain one just by being loaded. Replacing a wrong BPM takes the steps below.

Check your set's tempos →

Re-analyze the tracks that are wrong

Re-analyzing with Analyze BPM / Beatgrid checked overwrites manual BPM and beatgrid edits. Unlock anything you still want changed.

A blue lock is your mark that the BPM and beatgrid are finished. Hold control and click the empty Status column, the first column in the library. Control-click the blue lock again to clear it. The Pro page says a locked file will not get a new beatgrid. Lite's page says it will not get a new BPM or beatgrid. To lock or unlock several tracks, highlight them and click the Status column. Serato asks before it edits the selection.

A gold lock is the file, not a choice you made. BPM, beatgrid, cues and the other tags will not be written. A change during a session can look right and still not be saved. Serato names two causes: a drive the computer can only read, such as an NTFS drive from Windows opened on a Mac, or the file set to read-only. Highlight the track, press control + R to reveal it, then command + I on a Mac or alt + enter on Windows, and clear read-only if you are allowed to write.

Drag the track, a selection, or the crate onto Analyze Files. The plain Analyze Files button only analyzes files that have not been analyzed yet. Dragging is what Serato documents for files that already have a reading. Lite's page says that drag re-analyzes previous tracks, and that locked tracks are skipped.

If the old number remains, the preparing article has one more step. Auto BPM is not applied when the track already contains BPM information. Double-click the BPM tag, delete the value, and drag the files onto Analyze Files again.

Leave Analyze Entire Library unless you mean every file. That button re-analyzes the whole library. With Set Beat Grid/BPM checked, edited beatgrids are replaced. Locked files are left out.

Edit the BPM, or tap one in

Double-click the BPM field in the library. While that field is being edited, alt + up or down arrow doubles or halves the BPM. Serato's shortcuts page lists it under library actions, and says the alt key on Windows is option on a Mac. The halving note says the up arrow doubles and the down arrow halves, including for several files at once, and that the beatgrid follows the new number. Check the markers after.

You can also type a BPM you know and press Enter. That is the library step on Serato's page for writing a tempo in by hand.

TAP is a different case. It replaces the BPM only when no BPM is stored and Set Beatgrids is off. A wrong number does not become TAP. Click TAP to open the beatgrid editor, then tap the space bar on the beat. The first two taps set the range. After that you can tap double time, half time, or the start of each bar. Enter saves. Esc resets. Clicking the mouse in time works as well. Alt + spacebar opens the editor on the left deck, and the same keys again move it to the right deck.

To check the grid, load the track and click Edit Grid next to the elapsed time. The same page also writes Grid Edit. Alt + spacebar opens it too. Skip forward, including after a breakdown and again in the outro, and see whether the markers still fall on the beats. Enter saves. Esc leaves without saving.

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Keep the next tracks inside the range

When the number matches the count you mix at, hold control and click the Status column so the blue lock shows. A later analyze leaves that beatgrid alone.

Set BPM Range before the next tracks are analyzed. A house crate and a drum & bass crate do not share a useful limit. 68-135 is the range Serato names when you want 70 instead of 140. Do not use it when you want a count near 174 kept near 174.

Hear the set at the tempo you mix

A half-time library BPM makes a climb look like another set. In Sonata, a pair more than about 10 percent apart in tempo does not get a locked blend, so settle the scale before you judge the order. Sonata measures tempo from the audio. A BPM already in the file only helps it choose between that reading and half or double of it. Sonata suggests an order. It does not decide the set, and it does not write a BPM back to your file.

The listen-through, the keys and the tempo climb are in how to plan a DJ set. Where the hour sits is in how to structure a DJ set. When the tempos are close and the keys are not, is harmonic mixing necessary? is the note on leaving the wheel. Showing Camelot codes in the Serato library is in Camelot wheel in Serato.

For one file, the BPM and key finder reads the tempo in the browser. Your tracks stay on this device. They are never uploaded.

Hear your whole set before the gig. The first mix is free, up to 10 tracks, and it does not ask for an account.

Sources

Sonata is not affiliated with Serato.

Hear your whole set before the gig.

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