Yes, green means it is a RealTracks instrument assigned to that track. This would either be a RealTracks instrument that is part of the style you selected from the StylePicker, or you would have replaced the MIDI track yourself by control-clicking on the track and selecting Choose RealTrack. Since it doesn't sound like you added it yourself, you must have chosen a style with RealTracks. In the StylePicker, styles that start with an underscore (_style.sty) are all RealTracks, and styles that start with an equals sign (=style.sty) have some MIDI tracks and some RealTracks.

The best thing to do is to choose a style from the StylePicker that doesn't have RealTracks.

Alternatively, you could try control+clicking on the track and selecting "disable RealTracks for this track" - some styles with RealTracks will also have an appropriate MIDI track. However, note that you won't be able to get the same arrangement, because the RealTracks are composed of recordings rather than samples of single notes.

If you are hearing RealDrums when you load in MIDI-only styles, you can disable them (to only hear MIDI drums) by unchecking the "substitute....." option in the RealDrums settings window.

If you want to use RealTracks and don't need to save your songs as MIDI files, you could instead click the Audio button in the main toolbar to render your song to AIFF or M4A files. There are options for rendering the full mix or individual tracks.

Andrew
PG Music Inc.