LOL, and yes. I already have an answer from the github too. ( Calf github) https://github.com/calf-studio-gear/calf/issues/11#event-335984261 LMMS isn't capable of LV2 but only of LADSPA or VST. The calf plug-ins delivered with LMMS are outdated and not supported anymore since we dropped LADSPA supp...