Tempo Mapping

Tempo is never a straight line; a tempo map draws a performance's breathing onto the timeline.

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TempoDAWVelocity

The problem

Putting a played take on a DAW grid runs into a familiar snag: the player did not keep a fixed tempo, easing at phrase ends and pushing at climaxes. Force the grid to a straight line and notes drift further and further from it. A tempo map draws the performance's actual speed changes so the grid follows the player.

How it works

A tempo map places a series of tempo values along the timeline with linear or curved transitions between them. In a MIDI file they are tempo events; for audio you first analyse transients or record the player against a click that itself moves. Once mapped, quantising, copying sections and adding virtual instruments all share one reference. Free passages can carry a dense curve while mechanical sections stay flat.

Settings and practice

Listen through first and mark the points where tempo clearly shifts, then smooth the transitions between them. Easing at phrase ends and lifting slightly at climaxes is normal, but keep the amounts modest. When recording to a click, make the click follow the tempo changes too. After mapping, check that bars and grid lines land on natural phrase points. Confirm the tempo curve copies with any duplicated section. Automating virtual instruments against a tempo map is what lets them sit with a voice or a soloist.

What to listen for

In the ballade, whether the rubato is captured whole; in the quartet, whether phrase endings relax naturally; in the hymn, how steady tempo contrasts with free playing. A good tempo map makes the timeline look like a performance rather than a metronome.

Sources

• 速度映射与自由速度的处理方式，依 DAW 公开文档核对，未抄原文
• 演奏速度变化与记谱的关系，依表演实践通识核对，未抄文本

Used for fact-checking only; all prose is original.