Harmonize is a function in DJ.Studio that creates smooth and automatic transitions between tracks, without the need for manual beat-matching and crossfading.
Within seconds, Harmonize analyzes many possible combinations of your tracklist and determines the best track order and transition placement, based on the options you choose.
At the end of the process, click the Harmonize button. Each click gives you a different order, so if you don't like the result, just click Harmonize again.
If you already have locked transitions in your mix, Harmonize keeps those tracks and transitions in place and works around them.
The Harmonize wizard
Pressing the Harmonize button opens a step-by-step wizard with 3 steps:
Key mixing: choose your harmonic mixing style
Order: set how the track order is calculated
Transitions: choose the transition style, length and tempo sync
When you're ready, click Harmonize. DJ.Studio calculates the best track order based on your tracklist and the settings you chose, and you can review the result.ithin that same step. The sections below walk through each step in order.
You don't have to follow the steps in order. The steps are optional: you can click Harmonize right away with the defaults, or click on any step in the sidebar to fine-tune it first.
Step 1: Key mixing
This step decides how strictly Harmonize sticks to harmonically safe transitions.
Fuzzy Mixing only accepts transitions that are likely to work harmonically. It sticks to safe, closely related keys, so nearly every transition it suggests will work. It's the low-risk choice: the resulting order holds up with little or no repair work, which is what you want when you're preparing a live set or a radio show and can't fix a clash on the spot.
Mood Mixing uses the same harmonic matches, plus bolder key changes that can lift the energy of your mix. Those moves sound exciting but are riskier: melodies can clash, so expect to check every transition and use hard swaps, careful timing, or stem separation. Mood is the better choice for a mix you're producing in the studio and can fine-tune in detail.
Not sure which to pick? Start with Fuzzy.
Step 2: Order
This step controls how the track order itself is calculated.
Harmonize priority slider (BPM ↔ Key): sets the balance between ordering by BPM, by harmonic key, or a mix of both. Moving toward BPM sets a tolerance in BPM (e.g. "4 BPM") for how much tempo variance is allowed between consecutive tracks.
Tempo direction: order the mix from slower to faster tracks (Ascending) or the reverse (Descending).
Lock tracks (first / last): lock a specific track to always be the first or last track in your mix. Place the track in your playlist first, then toggle it on here.
There is no separate control for how long Harmonize spends searching for the best order.
Step 3: Transitions
This step sets how the transitions are built.
Harmonize places each transition where the outro of the outgoing track overlaps the intro of the next track. You'll see this confirmed above the presets: "Your tracks are mixed on overlapping intros and outros." This gives long, natural blends, so there's nothing to choose here.
Transition Style: pick from presets like crossfades, bass swaps, filtering, echoes, or your own saved presets.
Transition Length: how long each transition is.
Auto (default): the length follows the intro and outro of the tracks, between 2 and 16 bars.
A fixed length, for example 32 bars: every transition gets that length. If the transition style you picked has its own length, that length is used instead.
Synchronize Tempo: when on, DJ.Studio automatically keeps the tempo of both tracks in your transitions aligned.
Save these settings for next time: enabled by default. When on, your transition settings are remembered the next time you open Harmonize. When off, they apply only to this one Harmonize run, and tracks you add later keep your previously saved defaults.
What if a track has no phrase data?
To find intros and outros, Harmonize uses the phrase data that DJ.Studio analyzes automatically when you add tracks. See Phrase Detection in DJ.Studio.
No phrase data: if one of the two tracks in a transition hasn't been analyzed for phrases, Harmonize places that transition on bars instead, using the Transition Length you chose.
No intro or outro: if a track has phrase data but no intro or outro, Harmonize places a short transition of 2 bars at the end of the track.
Reviewing the result
Once Harmonize finishes calculating, you'll see your tracklist with match icons in the Match column showing the harmonic compatibility between each track and the one before it: green icons are good matches, yellow are close, and blue are further apart. See Harmonic Matches Explained for the full breakdown.
Re-Harmonize
You can re-harmonize your project at any point by clicking the Harmonize button again to reopen the wizard. Any locked transitions stay locked; unlocked tracks are free to be rearranged.
This is useful if you're partway through a mix and want a different order, or if you've added more tracks and want to re-check the fit.
How To Use Harmonize
Here's the full walkthrough from an empty playlist to a finished, harmonized mix, step by step.
Here's the full walkthrough from an empty tracklist to a finished, harmonized mix.
Add tracks to your mix: press the "Add Tracks" button, or drag and drop tracks from your hard drive.
(Optional) Choose your first and last track by placing them at the start/end of the tracklist, ready to lock in step 5 below.
Press the Harmonize button to open the wizard.
Key mixing: choose Fuzzy or Mood mixing.
Order: set the BPM/Key balance and tempo direction, and lock your first/last track if wanted.
Transitions: choose the transition style, length and sync.
Press Harmonize and review your newly ordered mix. Each click gives a different order, so click it again if you'd like another option.
Solving track-matching issues
If any of your selected tracks don't match well, you'll see a red cross in the Match column.
Hover over the cross to reveal the Solve button, and click it. DJ.Studio searches your selected libraries for a track that bridges the gap, and you can add it directly to your mix to resolve the issue
Frequently asked questions
Where did the Mix on step go?
It has been removed. Harmonize now always mixes on overlapping intros and outros, because that gives a good result straight away for almost every mix. If you had picked Bars, Phrase position or Song structure before, DJ.Studio switched you to intro/outro overlap automatically.
Can I still decide how long my transitions are?
Yes. In the Transitions step, set Transition Length to a fixed length, for example 32 bars. Leave it on Auto to let the intros and outros decide. You can set the same default at Settings > Transitions.
Do I need to analyze my tracks before using Harmonize?
No. DJ.Studio analyzes phrases automatically when you add tracks. If a track has no phrase data, Harmonize places its transitions on bars instead, using the Transition Length you chose.
Why aren't my harmonized tracks harmonically mixed?
Sometimes not all tracks end up harmonically mixed.
Common causes: you don't have enough closely related tracks in your playlist, one or more tracks has no compatible match in the playlist, or you set the Order priority toward BPM rather than Key.
Click the X icon in the Match column to have DJ.Studio search your library for a bridging track.
Is it possible to turn off Harmonize? I want to create the order myself.
DJ.Studio always places transitions according to your Settings > Transitions defaults. Setting In-mix point and Out-mix point to 0 bars gets you closest to no automatic overlap, and you can freely reorder tracks yourself in the playlist window.
Why can't I find the Harmonize button?
Harmonize isn't available in Mashup mode. Check the project name in the app header: if it says "Mashup," there's no Harmonize button. Choose "DJ mix" when creating a new project to access Harmonize.
Does Harmonize use Energy, in addition to BPM and Key?
No — Energy is subjective and varies by track segment and audience, so adding it as a third parameter would make the algorithm unclear. Harmonize uses BPM and Key only; you should still manually review your playlist order afterward.
Why don't the tracks fit harmonically after Harmonize?
Usually too few tracks (aim for at least 20–30 in a similar genre) or too much variance in key/BPM/genre across the playlist. Check the Match column for X's after Harmonizing, and click Harmonize again for a different order.
Why do the transitions sound bad after Harmonize?
Check your Settings > Harmonize defaults match your genre (e.g. short transition windows for disco, longer for techno), use stem separation for vocal-heavy genres like hip hop, and expect to manually fine-tune harder genres like Jazz. Harmonize proposes a starting point, not a finished mix.