I guess the indicator was intended for futures with daily bars, as almost all indicators by Ehlers. For Forex or other assets with very small differences, or for shorter bar periods, you must use an accordingly higher Factor.

You could experiment with a modification, for using really the rate of change instead of just a difference.

with Factor values [200000, 400000, 600000] difference becomes visible
(guess the instrument)

which leads me thinking – it’s a really bad parameter design

responsiveness is tightly coupled with how many digits signal value has

“`
#include // copy pasta from article

DLLFUNC void run()
{
StartDate = 20260101;
LookBack = 500;
vars p = series(price(0));
var x = OneEurFilter(p,100, .2); // <— notice Factor argument
var y = OneEurFilter(p,100, .4);
var z = OneEurFilter(p,100, .6);
plot("x",x,LINE,BLACK);
plot("y",y,LINE,GREEN);
plot("z",z,LINE,BLUE);
}
“`

all 3 graphed lines look identical

Thanks for the info! I got the code from Ehler’s TASC article.