I have a single MST Piano with several RTs in the style. No matter what I do I cannot make the MST button/track turn BLUE. It just toggles red to yellow. I see your midi track turns blue. Maybe it doesn't work with SMTs? What are the chances?

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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