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Sony Vegas: Velocity Envelope

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.