Transition

A transition is the passage from one track to the next. It can be two minutes of overlap or a hard cut; what defines it is not the technique but the result — that the room perceives continuity, or a deliberate surprise, rather than an accident.

Whether it works depends on several things at once. On BPM, because tempos far apart have to be worked. On key, because for the seconds of overlap two harmonies coexist. On phrasing, because the changes have to land where they belong. And on the energy jump, because two tracks compatible in all of the above can still leave a step the floor feels.

That last one is what can be checked without listening, and it is what EnergyCurve looks at: the analysis walks the set pair by pair and flags where the jump between neighbours is larger than the context tolerates. When both tracks carry a key, it also reports whether the harmonic move is one the transition table recommends.

What it does not judge is how you are going to perform the mix. A difficult pair with the right technique sounds better than an easy pair executed badly, and that happens in the booth.