Rekordbox 6.4.2 -- Does it solve the Big Sur + Audio Driver Problem??

Sorry, not yet - per the release notes:

IMPROVED

• New keyboard shortcuts have now been added for LIGHTING mode.
• Notes have now been added for fixture information in the search results in the FIXTURE LIBRARY screen for LIGHTING mode.
• The file type of TIDAL tracks will now appear as TIDAL(FLAC) or TIDAL(AAC).

FIXED

• Occasionally tracks were deleted incorrectly when attempting to delete a track in a playlist in Export mode.
• At times the Library conversion stopped mid way.
• Potential crash after canceling library conversion.
• Potential security issue.
• Improved stability and fixes for other minor issues.