@Deern @jean_cucumebr are you both using the Handy? It looks like the Handy API is not great so MFP has trouble working smoothly with Handy: https://discuss.eroscripts.com/t/multifunplayer-v1-25-2-multi-axis-funscript-player-now-with-slr-interactive-support/23006/471?u=f86k
Unfortunately I don’t have a Handy to test with, I’ve just been testing with custom single-axis strokers (Venus 2000-esque and SSR1-esque) over T-code serial.