It's not using the main bbw64.exe it uses bbw4_64.exe
I converted the file to 16bit and the noise is still there.
I tried it in Studio One and it's the same as Reaper.
There is no noise when it plays back along with the Studio One only noise when it plays in the VST.

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BiabVST-bbw4.png (8.92 KB, 41 downloads)