I can still hear audio from my GameCom 780/788 headset even at zero volume. Why does this happen?
This headset behavior was implemented so that the user can differentiate between when the headset is muted and when the volume has been turned down to 0%. As such, at 0% volume there will be a small amount of audio coming from the headset so the user knows the headset is not muted. When muted, absolutely no audio can be heard from the headset.