Flash grenade mechanism

Hello, everyone. I’m thinking about an implementation of a flash (stun) grenade. The “basics”: throwing animation, projectile and particle effects are understandable. Also, I’ve already made a blindness effect - all player within a certain radius, around the grenade hit, get effected by a Post Process Effect.

I can’t come up with an implementation of stun effect - so that the player will not hear any sounds except for the noise in his ears.
To lower (or disable) sounds I can use a Reverb Volume. But I can’t create volume dynamically. At least, not yet.
So, do I have to create a state, i.e. IsStunned, for my character and implement blindness effect there, in Character Blueprint???