How to: Master tempo & BPM fixes

Set the master tempo (the set BPM)

On the left of the timeline is the MASTER TEMPO box with − [ BPM ] +.

• Type a BPM (or use −/+) and every track re-stretches to it, pitch-preserved. A "Re-stretching…"

banner shows while it rebuilds (~1–2 min).

• Leave it on auto to let Mixx Intelligence pick a master from the tracks.
• Use this (not the tempo lane) when you want a clean, pitch-preserved tempo change for the whole set.

Fix a wrong BPM (half / double time)

Detection sometimes reads a track at half or double its real tempo. In the transition editor, bottom row:

• Type the true BPM next to a track title and click Set, or
• Click ×2 (fix a half-time read) / ÷2 (fix a double-time read).
• Then click ↻ Re-prepare to apply (re-stretches so it beat-matches).

AI Flex (fix drifting beats)

If a track's tempo drifts (its beat grid wanders off the kicks), click ⚡ Flex for that track in the editor. It warps the drifting grid onto a steady tempo. Re-prepare to hear it. The timeline draws a gold tempo-drift curve on tracks that wander, so you know which ones are candidates.

About very fast/slow tracks

A track far from the master (e.g. a 150-BPM track in a 103-BPM set) is brought as close to the master as possible without pitching it up — it's slowed toward the master rather than sped to double-time. Only genuine half/double tracks (≈2× or ≈½ the master) are played at the harmonic octave. This avoids the "chipmunk" fast-and-high artifact.