Conversion Skill-Mod Help!

So, after a break from working on my Bonecharmer, I return and am promptly stumped upon creating this skill Banshee’s Wail. The skill goes: base 50% knockdown, 50% fear, both for 1 second, then a one that adds damage, and theeeen a modifier, Sirens Song, that supposed to convert the 50% fear and 50% knockdown to Confusion and Convert. But I cannot figure out quite how to do that. In Conversions tab it has Stun but not Fear or Knockdown so I tried to do a -50 on the mods fear and knockdown tabs but with no luck. Is there a way to do this, and if so, can anyone help me figure it out?:confused:

-50% chance on fear/knockdown in offensive parameters didn’t work? How about -1 second duration?

Nope, no luck, but that registered on the skill I noticed. It said -1 seconds of fear, but putting -50 doesn’t seem to register or show. :undecided: