The lowpass first parameter 
(https://faustlibraries.grame.fr/libs/filters/#filowpass) has to be a « 
nonnegative constant numerical expression » , see : 
https://faustdoc.grame.fr/manual/syntax/#constant-numerical-expressions

So a slider cannot be used here. 

The reported error should be «  ERROR : stack overflow in eval », but for some 
reason the libfaust version in WebAssembly does not report it correctly for now.

Stéphane 


> Le 6 févr. 2024 à 12:30, Carlos Antúnez <carlosantune...@gmail.com> a écrit :
> 
> Hi, an "emsc" error message is appearing, possibly related with:
> 
> lowpass = fi.lowpass(n, fc);
> n = hslider("n", 1 , 1 , 700, 1);
> fc = hslider("cut", 252, 10, 10000, 1);
> 
> 
> 
> 
> What does it mean?
> 
> Thanks for the attention.
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