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Thanks Peter. I actually tried that first but it wouldn't play backwards. I may be wrong but I believe playback speed only accepts a positive value?

In my contraption you can kind of scrub the animation back and forth by spinning the wheel either way.

I considered what other gadget might act as a way to hold a value that can be incremented or decremented, e.g. the value slider, but that can't be manipulated in this way.

I just had an idea actually that I will try later. What about a + calculator gadget whose output is wired back into operand A? Then my velocity goes into operand B. You should get an infinite loop where the value gets incremented or decremented based on that 2nd operand.