OK I got the Standalone to function. But the chord chart drags behind the beat and is not in sync with the playback. Other than that it seems to work. The problem was apparently getting the Motu to operate at the 44100.

However still no joy with the VST3 in Reaper, which while appearing to be fully functional, remains silent.

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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