Classic filters work with or without keyframes, and so you can edit following the same procedure you did when you edited Realtime filters. However, there are a number of additional parameters for you to adjust. You need to look at each filter in turn to see to which extra parameters you can gain access.
One of the most interesting parameters available using Classic filters is Keyframe Interpolation. This governs the speed at which the effect happens between any two keyframes.
Remember; this is the "speed at which the effect happens" and not the "speed of the actual clip." You can only alter the speed of a media clip using the Timewarp non-Realtime filter, which I discuss later in this chapter.
You use Keyframe Interpolation simply to alter the pace of an effect. The following example shows a 2D Editor using this parameter to zoom in on the incoming clip. This happens slowly at first, then when it reaches the halfway mark, the zoom increases in speed until it reaches full speed at the end of the clip.
To alter Keyframe Interpolation