Lfo on float index for media bin

I feel like this is something I was able to do on vdmx5, but I haven’t been able to get it to work on vdmx6+. I’m trying to have a random lfo modulate the clip selection in the media bin. Under workplace inspector, transpose by index is selected with the random lfo doing the modulating. lfo is running. transpose by index is checked. Am I missing something?