5.5. BPM Matching and Allowances

Same Mix BPM compares rounded whole BPMs within the allowances below. Tracks keep their original playback speed and keys. The Mix table displays the rounded BPM, with the detected decimal available in the tooltip.

Same Mix BPM + pitch shifts also allows speed changes in the selected semitone range. Choose +/-1 semitone or +/-2 semitones directly under Pitch range; the second choice includes one-semitone changes too. Each track uses the allowed adjustment that brings its rounded effective BPM closest to the Mix target; equally close choices prefer less pitch change. Rounded playback ratios must remain within five cents of the selected semitone step. Keys shift with playback before Allowed Keys and transition matching are evaluated.

Same Mix BPM + keylock uses the same two BPM allowances as Same Mix BPM, comparing each track’s original rounded tempo before keylock. Eligible tracks are planned for playback at the Mix BPM while preserving their original keys. HDJ previews at the original speed and key, so you can judge harmonic flow before performing the tempo changes in your DJ software. The Mix table shows the original BPM used by the allowances, with keylock underneath; its tooltip identifies the planned tempo.

Same Mix BPM and Same Mix BPM + keylock both apply the sliders to original rounded BPM. Same Mix BPM + pitch shifts applies them after the selected pitch shift: a 120 BPM track shifted to 127 BPM and an unshifted 127 BPM track have zero effective BPM difference. In keylock mode, those tracks retain their original 7 BPM gap for selection, so a Between tracks allowance of 3 rejects the pair even when both could eventually play at the Mix BPM.

From Mix BPM allows each track to sit above or below the Mix target by up to 12 BPM. Between tracks allows consecutive tracks to differ by up to 3 BPM. For example, at Mix BPM 128, an overall allowance of 4 admits effective tempos from 124 through 132, while a between-track allowance of 2 requires smaller steps through that range.

The sliders are linear and move in whole BPM steps. Both start at 0, meaning an exact rounded match. Values stay in fixed positions with no decimal places. A drag creates one undoable change; double-clicking restores zero.

Ignore BPM leaves playback unchanged and matches keys without requiring detected BPM. Both allowances are hidden and ignored in this mode; their saved values return when any Same Mix BPM mode is selected. The two Pitch range choices appear only in pitch-shift mode. Switching modes retains the selected pitch range and both BPM allowances.

Allowances include their boundaries and apply to generation, same-key replacements, and Gem Finder. Locks and saved Gems cannot bypass them during planning. Changing allowances keeps authored rows and their original transition explanations, while incompatible rows show BPM limit with details in their tooltips. Allowances, reset, undo, and redo are saved with the Mix.

For keylocked performance, enable keylock in your DJ software. An exported M3U playlist carries track order and audio paths; it does not set deck keylock or tempo. HDJ’s keylock previews stay at the original tempo, while pitch-shift previews change speed and pitch together.