I need to connect the rotational value of a pressure gauge needle to the Audio Amplitude keyframes of some music. But wait, the problem is, I'm struggling to figure out how to make the the needle waver both ways rather than just clockwise. I essentially need every other keyframe value to be inverted so the needle pivots between positive and negative values on the dial.
Once this is sorted I plan to apply a smooth expression that makes the motion less jarring. I can imagine I'd most likely need to multiply the values too as smoothening over frames that strobe between positive and negative would probably create a particularly tame averaged value.