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Wellllll, I can't think of any VSTi's for this. But if you're using FLStudio, the Peak Controller does exactly that. Also the formula controller as well, it's a little more complicated, but pretty sweet once you figure it out.
Also, if you open up the event editor for a parameter in your synth, you can use the LFO function in the menu. If alows you to graph an LFO and shape it to your liking.
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