Trenches - Enemies can now hear your voice, breathing and screams! MICROPHONE INPUT UPDATE!
The new update includes a new feature which twitch streamers may not like very much, which is Microphone Input. The enemy can now hear you if you have a microphone. It can hear you talk, scream and breath. This means that if you have a mic and you make a sound when close to the enemy, then he can hear you and come running towards where you are.

Source and More information: Trenches – Enemies can now hear your voice, breathing and screams! MICROPHONE INPUT UPDATE!

Author: indieDB.com