Organ

This plugin claims to be based on setBfree, which is only available as LADSPA Version 2 plugin so you probably need a FOSS DAW like Ardour to use that. This one is in VST or audio unit which are more poplar formats. Unfortunately the original setBfree has more parameters while this one only has these on the panel. Also the output level is notably lower which means if you really need to consider use it you need a gain. The audio is smooth and that's the good aspect. I'd rate it 3.5 out of 5 for the above reasons, additional 0.5 for a clean clutter free interface.