Thanks Jeanette, this is very helpful. I’ve not played with pvstrace before. How did I miss this? It looks great! I think I can pull something together with this and a few other pvs opcodes.
Also, just for your files, after I wrote to the list, I was able to get my original loop working as it should; I moved the pvsread inside the loop as well – I can maybe intuit why this might be right under the hood but still feel uncertain. In any case, many ways to solve this problem, and thanks to you, a likely new favorite opcode.