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, Motu Audio Express 6x6 - My SoundCloud (Tip: No need to create a SC account to hear music - just hit ESC ).