How to set opacity using operations for condition file

Builder
1

Setup:
Win10, Standalone PsychoPy2 version1.92

Hi there, I am varying opacity for each frame for my stimuli. I currently used operation $((frameN % 20) <= 10) for opacity in the builder. This works fine. However, I want to vary the timing for each repeat. I set the same oeprations in the condition file but it doesn’t work. Does anyone know how to vary opacity for each repeat plus each frame?

2

Please specify how you want to vary it. But in essence, you would just incorporate a variable from the conditions file into your expression above (e.g. presumably putting a variable name in place of 20.