Which addon of Legion decrease the stun time (after FF)?

DwightsLifeMatters

I never had so many issues understanding killer addons before with any other killer.
Also, are his addons stackable or not? Some people say yes and others say no.

Unnamed_Freak

Julie's Mixtape, Joe's Mixtape and Cold Dirt, decrease the cooldown of Feral Frenzy slightly/moderately/considerably.

Most of Legion's add-ons stacks, the ones that don't are the Iredescent Button, Fuming Mixtape, Frank's Mixtape and Stab Wounds Study.

Misa22

EXACTLY, the descriptions are confusing, or at minimum, more that it should. 

wladimiiir

Decrease time for these addons

Considerably - 1s
Moderately - 0.75s
Slightly - 0.5s

HellDescent

all addons stack except franks mix tape, stab wound study, iridescent

Boss

https://deadbydaylight.gamepedia.com/Add-ons#Feral_Frenzy
For future reference.

Spiritbx

So by reduced cooldown they mean reduced stun time?