Active audiosource change on button press. Making a ingame radio.

Hello everyone! I am now working on my game, and I want to make a radio system like GTA or Saints Row in my game. For 1st try I wanted to use gameobject with attached script and 2 audiosources with audioclips. I wrote script, which on button press activates 1st source (deactivates 2nd); activates 2nd(deactivates 1st) but it's wont work. So, there is a script -

 var audio1 : AudioSource;
 var audio2 : AudioSource;
 
 function Update () {
         if (Input.GetKeyDown ("1"))
             audio.Play(audio1);
             audio.Stop(audio2);
     if (Input.GetKeyDown ("2"))
             audio.Play(audio1);
             audio.Stop(audio2);
     }

Then, I tryed another code:

 var audio1 : AudioSource;
 var audio2 : AudioSource;
 
 function Update () {
         if (Input.GetKeyDown ("1"))
             audio1.active = true;
             audio2.active = false;
         if (Input.GetKeyDown ("2"))
             audio1.active = false;
             audio2.active = true;
     }

But it's dont work too. I googled this topic, but people just made a radio stream from internet. I want to use local music from game assets for radio system, and change it with keyboard button. Thanks every one, waiting for ideas.