If you have the 32-bit version of BiaB working but not the 64-bit, you may just be able to copy over the file.

There are gn.dls files as follows:

C:/Windows/System32/drivers/gm.dls
C:/Windows/SysWOW64/drivers/gm.dls

and the two copies are identical.
If the 32-bit version is working andf the gm.dls file is present in C:/Windows/System32, try copying that file into the C:/Windows/SysWOW64 folder.


Jazz relative beginner, starting at a much older age than was helpful.
AVL:MXE Linux; Windows 11
BIAB2025 Audiophile, a bunch of other software.
Kawai MP6, Ui24R, Focusrite Saffire Pro40 and Scarletts
.