There's a workaround for RealTracks that can be used for a per project placeholder for storage.

For a per-project RealTracks list, it's a good workaround available with certain requirements.

For RealTrack instrument tracks storage per project, each of the 24 tracks has a 10 instrument sub-mixer window. This provides 264 slots that RealTracks can be placed on and selecting settings so only the original RealTrack plays so they operate essentially for storage of alternate RealTracks for each RealTrack Mixer Channel and are saved with the project. To use this feature for RealTrack instrument storage only; Mute the track

For every track you use, first assign a RealTrack in order to enter the RealTrack Dialog page where the RealTrack Medley Maker is located.
On the RealTrack Dialog Page, select the Settings Button to access the RealTrack Medley Maker.

Any Mixer intended to play during Playback or Rendering, the requirements are setting the playback to change instruments by selecting 'Chorus' from the dropdown window and using the original Channel RealTrack twice for whatever the number of Choruses of the song are set to. For a Chorus set to 1, the first and second slot must be the same because if the Ending setting is on, this will cause the second instrument on the sub-mix slot to play the ending. For example, a Mixer Track with a RT4000 Sax, the track below it on the Medley Maker sub-mixer will also have RT4000 Sax, to have continuity of that instrument playback.

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