They were created before https://github.com/LMMS/lmms/pull/3326 and added after it.
* ReverbSC: Method to change samplerate (#3401) * ReverbSC: added mutex for protected malloc * ReverbSC: small CMake fix to remove warning message * ReverbSC: samplerate changed to uint32_t. more CMakeFile tweaks * Fix dc block on oversampling
* ReverbSC - Plugin. lmplementation of the Sean Costello reverb algorithm