This is an approximately half hour video by Michael Patti showing a short cinematic composition created in real time. This provides a good example of layering and doubling various orchestra ensembles.
I’d don’t record entire ensembles at a time myself because I want to think about what each section is playing so I don’t end up with more strings playing than what an orchestra actually contains but this shows an interesting way to generate ideas and get some results quickly which I believe is the main intent of this video.