[mattr "ball.translateX" $f] = will use the ball translation attr as reference.

can also do -> .5*[ mattr "ball.translateX" $f]

lerp (10,100,$pct) - linear interpolation between 10&100 thru time

ease (-1,1,$pct) -smooth interpolation between -1 & 1.

abs ( ease (-1,1,$pct)) - make sure that all of the resulting number from the previous expression are positive.

noise (5*$pct)

do I need to declare $pct?
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