I'm trying to get Blast to recognize a primitive group driven by a channel, e.g.

@bldgID==ch('soloBldgID')

where the channel is either a custom integer channel created in the Blast node itself , OR a reference to data from a different node, eg

@bldgID==point("../REF_ptnum/","ptnum",0)

where REF_ptnum is just a null nested within a For Each Pt loop running on some scattered points.

If I type in an explicit value, Blast responds as expected, but channels don't seem to evaluate, returning just 0.

Am I doing something wrong, or is there some limitation of the Blast node? Delete node is giving me same results.

Ultimately I'm trying to Copy to Points a variety of objects (read from a sequence of bgeo's) without having to separate out a bunch of objects manually into a Switch. Hope this makes sense. My file is from a paid tutorial unfortunately, but I made a dumbed down version fore reference here.
THANKS!!!