I just spend 30 minutes which I will never get back going down this midi rabbit hole one more time. I immediately determined something is amiss. BIAB midi has always been what I term a hot-mess, but I can generally find a way to work around it.

Take a look at my default midi channel setup ( after a return to factory settings). I have multiple tracks sharing Ch#1. When I load the demo style, the piano and vocal choir both are on Ch#1. The piano patch plays the choir, not a piano. And the choir also plays a choir.

This is generally where I just stop. I will pass this thread to the development guys to see if they have a fix for all this.

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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6