if you are using the most up-to-date version of Maschine (version 2.3.x), you are out of luck because Maschine currently DOES NOT work with Sonar (though NI claims to be working on a fix). granted, i don't know anything about a Steam version of Sonar. when NI does fix Maschine, if you want to use the device as a MIDI controller, you will need to have NI's Controller software, or, if you want to use it as a VST plugin so that you can employ the Maschine library, you would just need to make sure the plugin .dll file is in your plugin folder. when Maschine isn't broken (like it is today), there's a lot of power to harness, for sure.