The HX Effects manual says, "NOTE: Just like a true speaker cab, IR blocks are mono. Therefore, an IR block will sum any stereo source that is fed into it to mono."
I get that. It doesn't sound like there an option to set the IR block to stereo? If not then it has to be placed before any stereo blocks. So the IR block would come before effects like stereo delay and stereo reverb blocks. If that is true, my question is does having the IR block that far forward in the chain affect the ultimate sound at the end?