How to increase speed to marker

using FCE...
i am trying to devise a way to increase the speed of a clip midway through to have it end at 200% at a marker in the timeline that matches a specific beat in the audio. that is, i would like the action to ramp up from 100% midway through a clip to end at 200% at frame of my choosing to meet a beat in the audio that i have marked in the timeline above.
regular clip speed>sudden, rapid increase to 200% speed>clip ends on the frame i want and at the beat i want.
i am working away at it, but any suggestions would be greatly appreciated
thanks

The best way I can think of would be to first make it into two different clips (FCE doesn't allow you to keyframe speed). So first, cut the clip at the point where you want it to speed up (blade tool, B). Next, lets have the second clip speed up the way you want it. Highlight the clip, go to modify->speed (I believe the shortcut is command-J). Now type in the speed change you want (in this case, 200%). After you have finished with that, ripple edit the second clip to the point in the audio you want it to stop (or you can put a marker there by clicking M, and if you have snapping turned on it will snap to the marker).
While this makes a nice effect that I think looks good, it skips from 100% straight to 200%, which I don't think is what you were wanting to do. The only thing I can think of at the moment to do in FCE to ramp it up from 100% to 200% is to do the same process described above, but cut it into several sections, and apply different speeds to them (eg 100%, then 110%, then 120%... then 200%). There might be a better way of doing this but since at the moment FCE speed doesn't appear to be keyframeable this is my best suggestion. If you do enough of these clips with increasing speeds, you should get the same effect.
I hope I was of help, and good luck with your project.

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