The problem is css v34 (Counter-Strike: Source)

As for the game CSS v34 to configure voice chat.When I press the button my voice vylaziet yellow speaker in the corner and all voices are not heard.I have the microphone working.I read on the forums that it is necessary to enter the command voice_loopback 1 in the console,I did it, I have earned a voice message.But the problem is that every time you start the game I need to enter the command voice_loopback 1 otherwise voice will not work.Tell me what to do to not enter this command when you start the game and to voice chat to work correctly always.Thanks in advance.