I have not read through all this thread but yes there's loops and Virtual Instrument as mentioned that can be made into UserTracks or use direct.
How easy is this now with Midi Chord Track Drag Export.
Just drag any RealChart it into the Piano Roll, select just the Chord Track Channel, load you Virtual Instrument in that will follow this, draw the midi pattern change notes or program change in where you want the pattern to change or drag n drop any other midi patterns in like MusicLab's RealGuitars.

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