Hi there, I believe we can use an adxl that we already use for input shaping in another capacity. Instead of using music tuning apps to find the belts frequency for corexy machines we can reuse the adxl mounted on the hotend in live monitoring mode like a spectrum analyser.
I see what has been already considered but it’s not quite what I was suggesting. I mean a proper graphic interface (window like camera or temps) with a proper real time spectrum analyser. Maybe with the ability to record data for short times in which we will pluck the belts by hand. I believe that this way we can reduce drastically the time needed to tension the belts relative especially to the first link you shared.