The video time didn't work, but I think I know what you're talking about - I'm guessing the wiggle during the big symbol crash. That would be something like this:
s=thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");
threshold=25;
howmany=3;
amount=50;
x=value[0];
y=value[1];
if (s < threshold) [x,y]
else [wiggle(howmany,amount),wiggle(howmany,amount)]
The threshold controls the value the slider must be to activate the wiggle. How many is how many wiggles per second. Amount is how many pixels the wiggle can move (in this case anywhere between 1-50)
This is untested, btw, so let me know if there is a problem.
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George
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