Bob - regarding your first response:

You are absolutely right that I’m confused about what I’m doing. I think the process is extremely complicated (the terminology is often impenetrable), and my understanding of how it works is still very limited. I appreciate the responses I’ve received – suggestions and queries from all of you have been very helpful.

My issue regarding the Mixer RealDrums track (green) appearing to become MIDI (yellow) after Audio rendering hasn’t been resolved, but (as you imply) may perhaps be due to another misunderstanding on my part. I was under the impression that Realtracks are green and MIDI tracts are yellow, but if this is not invariably so, then of course the yellow Drums track might not indicate MIDI at all (?).