This is just to show that it doesn't need to create a wav it can play direct from the source files, this is what Reaper does and most DAWs these days, they use non destructive audio editing so it's not creating a lot of wav files. They are getting there, the 2022 release can now use data in the Util tracks rather than wav files.
When this is added to the BBPlugin it will be very quick with no wait time for generating and won't create wav files upon wav files. It will just play the track sections direct as Reaper is doing in the pic:

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