Override the push to talk keybind to toggle mute instead.
Install BepInEx.
Place the ToggleMute.dll in the BepInEx\Plugins folder.
Run the game at least once in order to generate the configuration file.
The file is located in your Steam install folder.
Default location: C:\Program Files (x86)\Steam\steamapps\common\REPO\BepInEx\config\soundedsquash.togglemute.cfg
Enabled: Enable this mod.
StartUnmuted: The mic will be unmuted when the game starts.
Black mute 2 icon is provided by icons8 under the CC BY-ND 3.0 license.