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To quickly adjust envelopes in Sony Vegas, you can draw envelope points freehand using the Envelope Brush. With the Normal Edit or Envelope tool active, hover over an envelope. Hold Shift to display the Envelope Brush cursor. As you drag the cursor along the track, a trail of envelope points are created. When you release the mouse button, the points will remain.
Velocity Envelopes can be used to speed up, slow-down, and freeze video in Sony Vegas. To use a velocity envelope, right-click a video event and choose Insert/Remove Envelope > Velocity. Drag the envelope up to increase the clip speed or down to decrease the speed. Drag it to 0% and the clip will freeze. Setting it to a negative value will cause the clip to play in reverse. Double-click to add anchor points to speed or slow down the clip at different points.
