Hi, I solve it. I builded pd-0.50.2 from the src, then installed pd-iemlib from the respositories and added my ~/extra/iemlib path. It worked perfectly. The problem was in a raspbian with pd-049, the one that came in the respositories... it had some conflict with filter~.

Hi, anyone know how to solve this? I have some patches with bp2~_butt, hp10~_butt, etc, etc, that all works with the filter~ objects. Is there a substitute for butterworth filters? Thanks in advance!