You can see here Studio One needs MTC or MMC to sync with Biab as master.
There seems to be no option in Biab for MTC or MMC, again another industry standard thing, see in S1 device options it allows you to send MC MTC or MMC.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
BB23-Send-Midi-Clock.png (73.36 KB, 68 downloads)
S1-Send-MMC-MTC-MC.png (52.42 KB, 68 downloads)