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Once you can see a volume line, you can adjust it using the mouse or the sliders in the Audio Editor. If you use the mouse to directly alter a key and add keyframes, you have the advantage of being able to match keyframes with significant events on the Timeline. But this way of doing things does lack accuracy; for that, you need to use the sliders.
✓ Tips
Remember, the Audio Editor must be open for you to adjust an audio track on the Timeline. If it is not open, you won’t be able to access the keyframes with the mouse.
Keyframes—like media clips—are used as a magnetic point when moving the Timeline cursor around the Timeline. However, you can toggle this magnetic effect off by holding down the Shift key.