Congo Jr (Cobalt) Intensity Chase Effect from Groups


I hope I'm just being really stupid and can't work this out - I've done this many, many times on the EOS (Gio) family consoles but can't seem to get it to work in a similar way on Cobalt.

I have four groups on my direct selects, and I want to chase the four groups in sequence.  Whenever I create a chase effect, it doesn't read the groupings and just creates random chases from the channel numbers.

On EOS I can edit the chase step by selecting the chase step channel spreadsheet field and then direct selecting the group - this doesn't work on Cobalt.  It seems once Cobalt decides what's in a chase step it's completely locked.

Can someone point me in the right direction?  All I want to do is create a simple four-colour chase from the groups?