FatJak I upload all the [s2f~] objects from the else library to the IDE, i have

You shouldn't do that. Only update files that end in .pd or .pd_linux remove all other files from the project

FatJak No MIDI device enabled
Illegal instruction
Makefile:621: recipe for target

So in this case there is a sf2~.pd_linux file in your folder and/or in the pd-externals folder? Where did you get this file from?

    giuliomoro i guess from
    https://github.com/BelaPlatform/Bela/files/4431515/else-v1.0-beta27.zip
    I have tried several times to delete my project and the "pd-externals" dummy project to make a "clean" install,
    and every time Bela ask to replace or not the files, as if everything was still in place after deleting the "pd-externals" dummy project.
    And because i have also try to manually upload objects (from my computer pd-externals library) in my project, could they are still there even after delete the project ?
    It become foggy for me !

    FatJak Or perhaps i don't understand which file you are speaking about ?

    that seems to be the right question to the answer. Weird that you'd get SIGILL from it. Anyhow that's an old version so I'll build a newer one.

      giuliomoro
      So, just to confirm what I believe to understand, it's not possible to use Pd externals before your intervention ?
      Or there is other ways to use them ?

      one can build them for themselves and not wait for me, but build instructions may change for each external which is why I am building them on request. In the issue you linked to I provide build instructions for building ELSE so you may want to try rebuilding its latest version following those instructions and maybe it'll work for you.

        giuliomoro Ok, ... this is going to be brainly overloaded for me. I've already hundred questions to even begin to try. I'll try one day. Thanks !

        can you confirm whether the illegal instruction error still happens with the latest build of else?