It sounds like the OP is patiently navigating two known issues with Roon/Tahoe:
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the GUI is crashing. There is a fix for the first issue contained in the most recent release, build 1582. Please update per @noris’s suggestion to help with this one.
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the HAL isn’t initializing properly for generic/custom USB class-two audio devices with Roon during sample rate transitions. This is a deeper issue and concerns
coreaudiodiscrepancies introduced by Apple with Tahoe. This fix requires more serious intervention by the team and potential involvement from Apple.
Please refer to the main tracking thread shared by @noris for announcements from the team concerning the second issue.
For housekeeping purposes and to keep responses in one thread, we’ll be closing this thread.