片段增益线Clip Gain Line

难度LEVELL1 · 入门L1 · Beginner 领域TOPIC音频

先学：Prerequisites: 时间线

学习目标LEARNING OBJECTIVES

学完你能用时间线上的片段增益线（Clip Gain Line）快速调整音量，并用关键帧让音量随时间变化。

概念说明CONCEPTS

片段增益线（Clip Gain Line）是时间线音频片段上部的白色水平线——上下拖动即调整整个片段的音量，是最直观的调音量方式。

  • 拖动即调：上拖变响、下拖变轻，拖动时提示框实时显示 dB 增减量。
  • Shift 微调：按住 Shift 拖动可放慢变化幅度，适合精细调整。
  • 双击归零：双击增益线重置为 0 dB，恢复片段原始电平。
  • 关键帧让音量变化：Option（macOS）/ Alt（Windows）点击增益线可添加关键帧（keyframe），两点之间音量平滑过渡——音乐闪避就靠它（见 音乐闪避）。

操作步骤STEPS

  1. 用 Shift + 滚轮把音频轨道拉高，看清波形和白线
  2. 鼠标按住片段上部的白色增益线，上下拖动拖动片段增益线调整音量
  3. 看拖动时提示框的 dB 数值，到目标值松手；微调按住 Shift 再拖
  4. 需要片段内音量变化时，Option / Alt 点击增益线打两个关键帧在增益线上添加关键帧
  5. 拖动第二个关键帧之后的线段，让后段音量升或降

练习PRACTICE

  1. 把一段片段的增益线下拖到 -10 dB 左右，再双击重置，听两次的差别。
  2. 给一段音乐打四个关键帧，让中段音量降下去、两头恢复，回放听过渡是否自然。

常见问题FAQ

为什么我拖不动那条白线？

确认鼠标指在片段上部的白线上，而不是波形中间；轨道太矮时先用 Shift + 滚轮把轨道拉高再拖。

增益线上的数值是片段的实际音量吗？

不是。它显示相对原始电平的增减量（dB）；片段的实际响度要看混音器（Mixer）里的电平表。

打完的关键帧想删掉怎么办？

Option / Alt 再次点击那个关键帧即可删除；双击增益线则把整段调整重置回 0 dB。

Learning Objectives学习目标

After this card you can adjust volume quickly with the Clip Gain Line on the timeline, and use keyframes to change volume over time.

Concepts概念说明

The Clip Gain Line is the white horizontal line across the top of a timeline audio clip — drag it up or down to adjust the whole clip's volume, the most direct way to set levels.

  • Drag to adjust: up for louder, down for quieter; a tooltip shows the dB change as you drag.
  • Shift for fine moves: hold Shift while dragging to slow the change for precise adjustments.
  • Double-click to zero: double-clicking the gain line resets it to 0 dB, the clip's original level.
  • Keyframes animate volume: Option-click (macOS) / Alt-click (Windows) the line to add keyframes, and volume ramps smoothly between them — the basis of music ducking (see Music Ducking).

Steps操作步骤

  1. Use Shift + scroll to make the audio track taller so the waveform and line are easy to see
  2. Press and drag the white gain line at the top of the clip, up or downDragging the clip gain line
  3. Watch the dB tooltip while dragging and release at your target; hold Shift for fine control
  4. To vary volume inside a clip, Option / Alt-click the gain line to add two keyframesAdding keyframes on the gain line
  5. Drag the segment after the second keyframe to raise or lower the later part

Practice练习

  1. Drag a clip's gain line down to about -10 dB, then double-click to reset — listen to both versions.
  2. Add four keyframes to a music clip so the middle dips and both ends recover; play back and judge the transitions.

FAQ常见问题

Why won't the white line drag?

Make sure the pointer sits on the line at the top of the clip, not the middle of the waveform; if the track is too short, raise it with Shift + scroll first.

Is the number on the gain line the clip's actual volume?

No. It shows the change relative to the original level in dB; actual loudness is what the Mixer meters display.

How do I delete a keyframe I added?

Option / Alt-click that keyframe again to remove it; double-clicking the gain line resets the whole clip to 0 dB.

深度资料：片段增益线 →Deep dive: 片段增益线 →

本卡术语Terms in this card

时间线Timeline 响度Loudness 检查器Inspector 关键帧Keyframe 转场Transition 调音台Mixer Gain（亮部）Gain