EigenStudio® and OS X 10.11 (El Capitan)
mh's EigenStudio® application can fail to work properly under OS X 10.11 (El Capitan) when using audio devices with no inputs (e.g. Built-in Output on a MacBook Pro). Two possible work arounds are suggested: a) select an audio device that has outputs AND inputs or b) create an aggregate device by combining the output-only device with a device that provides inputs (e.g. Built-in Microphone).