When I played NLog Pro track back, it had the Drum track in it as well as the instrument. It sounded as if the track recorded through the ipad external mic which captured everything.
I turned off the yellow monitor button (that has what looks a speaker in it). In fact, the track sounds like I recorded it with the yellow monitor button on but I only recorded with only the record button on. Tested it 5 times. Same Result.
the yellow monitor button only appears when the source of the track is external (e.g., the build-in microphone). If you use an Audiobus application as a source the yellow should not be displayed. So, before recording with Audiobus, you should make sure that the Audio input is set to the Audiobus and the correct application.
the reason is that the apps that are connected via Audiobus make sounds anyway since you either trigger them via their built-in keyboard or via VIrtual MIDI. Thus, monitoring these track from within Cubasis would not make a difference.