Every time i test my microphone on steam or in the Garry’s Mod options menu, it sounds fine. Yet when i speak in the game it sounds like a whisper. I am using a Mad Cats USB microphone which was made for the Xbox 360 Rockband but is also compatible with my computer. Also it was working fine last week but suddenly became quieter.
Mess with the settings. Raise the mic boost a little more.
Everything is already on max.
Are you sure Microphone Boost is on in your Windows sound settings?
The game’s boost is a bit crappy sometimes. Try to connect your mic to another port, if you have one.