I ran some simulations and I think that pressure_advance_smooth_time may have a notable effect on pressure_advance calibration (and a non-linear impact). However, it seems to be for different reasons than I originally described. I don’t want to derail this thread, so I started another thread at Pressure_advance_smooth_time skews pressure_advance .
I agree that pressure_advance can have a complex reaction with input_shaper. And I agree that modelling that interaction may be an interesting approach to improving quality.
Cheers,
-Kevin