Here ya go:  See the Pen OJgeKMG?editors=0010 by GreenSock (@GreenSock) on CodePen   I'm just using gsap.utils.wrap() to set up a wrapper function. You feed any value in and it'll wrap it between those values, so -101 would become 399 since it's wrapping from -100 to 400.    Read about the modulus operator here.   Does that help? 
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