Syntakt Overbridge Outputs (to ST)

I notice that in OB Control Panel there are two stereo (Main and Pre FX) and four mono (“Analog”) channels going To the ST.

When I use OB in Ableton there are four stereo pair outputs to the ST all called “SideChain” but there isn’t a compressor on the ST. If I try and send audio to the OB outputs the meters in OB control panel don’t register audio incoming.

Can anyone help me understand what the outputs are and what they can be used for (and how) and comment on the discrepancy in what they are called?