I think the real answer here is that the way BIAB would play an open bar would will depend on the style.

However, here is an example which shows that the play back is identical.

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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, Motu Audio Express 6x6 - My SoundCloud (Tip: No need to create a SC account to hear music - just hit ESC ).