[Ep] Exposure – 1 per pass, Custom Property, Preset
Allow you to control properties in Render Setup dialog > Environment Tab > Exposure Control Parameters rollout
3dsMax has multiple Exposure controls. Therefore, you need to choose which exposure control will be used. You can have different exposure control per pass. When you add or remove properties, only pmodifiers with the same type of exposure controls will be synced.
This is a custom property pmodifier. You need to explicitly choose which properties you want to control.