I've installed the version available through the Software Informer page and it doesn't appear to support command line recording. After installation, the Help guide was launched and then I used the Search function to locate all the supported features, but unfortunately, the command line feature doesn't appear to be supported.
You can use the MP3 Recorder from Piston Software as an alternative and with cmd line support: http://www.pistonsoft.com/mp3-recorder.html