Here is where Synthfont DLL is located on my machine and all works fine.
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I only use the BIAB VST in Reaper where the audio is fine. So can help you with your second question.


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