Hi Bernard,

I think you may not be choosing the best synthesiser for that.

I think you probably should use a DXi/VSTi synthesiser, which BiaB should then be able to render to a .wav or similar file. I think the Microsoft wavetable synth is external to BiaB.

There are several good synths that can be used in the DXi/VSTi option. There's a thread in the "Band-In-A-Box for Windows" forum that's discussing that right now.

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Jazz relative beginner, starting at a much older age than was helpful.
Kawai MP6, Korg M50, Ui24R, Saffire Pro 40.
AVL:MXE Linux; Windows 11; Win8.1: Scarletts
BIAB2022 UltraPAK, Reaper, a bunch of stuff.