Currently, OnSong does not support and is not compatible with Ableton Link. We have gone back and forth with Ableton to figure out why this is and to get a proper SDK working, but up to now, it has been to no avail. We do hope to make OnSong compatible with Ableton Link in the future. Of course, OnSong is compatible with Ableton Live and receiving/sending MIDI signals to and from Ableton in this manner. But Ableton Link is currently not supported by OnSong.