Default is 44100 Hz, this will make sure microphones with different sampling rates are supported (e.g. 48000 Hz).
According to the plugin repo, "The plugin is made to work with 1 channel and/or 2 channels (ladspa plugin), 16 bit, 48000 Hz audio input. Other sample rates may work, or not...". Most microphones are 44100 Hz and apparently that works fine as well, but maybe some of the people reporting that Cadmus doesn't work for them have a mic that uses a different sampling rate.
Default is 44100 Hz, this will make sure microphones with different sampling rates are supported (e.g. 48000 Hz). According to the plugin repo, "The plugin is made to work with 1 channel and/or 2 channels (ladspa plugin), 16 bit, 48000 Hz audio input. Other sample rates may work, or not...". Most microphones are 44100 Hz and apparently that works fine as well, but maybe some of the people reporting that Cadmus doesn't work for them have a mic that uses a different sampling rate.