User:Megarom
From EVE University Wiki
How to set it up?
After installing when you run mumble the first time an audio settings wizard is presented to you. It is recommended you go through it carefully, but there are few things I would like to highlight.
When you reach a screen that looks like this select the top radio button, click on the box on the same line and press the key you you want to use as the Push-to-talk key.
Connecting to server...
Advanded settings checkbox
Setting keys...