In the attached patch, I've used [funbuff] to monitor/ manage x/y pairs from [matrixctrl].
([matrixctrl] > [zl.rev] > [route 0 1] > [prepend delete/set] > [funbuff])
Past that, I'm using [thresh] to capture lists of each axis.
The issue I've run into is that [funbuff] is behaving in a "one non-zero-cell per column" manner, and I'd like for it to represent all active cells, regardless of how many there are per column.
Perhaps, [funbuff] isn't the solution I'm looking for, but I'm out of ideas for further workarounds.