HI BDAqua, a small update.
I installed Sidify and had exactly the same issue - MJAudioRecorder. (So Sidify records the audio it downloads). I had to dig about via a typo 'MjAduioRecorder' for the complete solution - the one you found plus another file:-
In addition to removing the driver, there's also the LaunchDaemon file that opens it at startup. So:-
- Open /Library/Audio/Plug-Ins/HAL folder in finder.
- Delete the MJRecorderDevice.driver folder.
- Open /Library/LaunchDaemons/
- Delete com.mingjie.mjrecorder.agent.plist
- Restart
The plugin file is the main one - the .plist is just a bit of extra housekeeping to reunite orphan and parent as they leave your machine, and maybe save a few milliseconds or so on startup.