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You can't do that in real time.
You've got two options:
1. Get an attack effect pedal: When you play hard it turns the volume down, then swells it at a speed you select
2. A reverse delay: Lee Ranaldo uses a Danelectro Back Talk
I use an Electro-Harmonix Stereo Memory Man with Hazarai- I can have a reverse echo up to 1 second in length (well I think it can get even longer than that if I tap a really slow tempo) and I can cut all the clean signal. It also has a normal echo setting where you hit a switch and it plays your last 7 seconds of playing in reverse. That setting is way cool. Finally, it has a looping mode, with the ability to reverse the loop.
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