#local d = 4 * (1/20);
 #if (fr > 178) #declare speed = _clamp(speed-d,0,4); #end
 // I cant believe I wrote that expecting it to work, and it did.
 // how did that work? it had to remember from last frame?

evidence of remembering a var from past frame?
 or twilight zone? ever been there?
  saw speed go to 0 by frame 200 in the vid!?!?!
that was the only line to change speed value of 4.

 // everything else expects it to start over. like this
 #if (fr > 178) #declare speed = _clamp(4 - 4 * ((fr-178)/20),0,4);

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