I've plugged a computer into an amp, using a 1/8 inch male extension cord, into a female adapter, that adapts into a male microphone 1/4 end. That being said, the amp sits at about half volume all the time because there are other things that play on it. (This issue is not flexible, nor is changing the amp)

The problem is that now, even when I mute out the computer, you hear some static in the background.

I was wondering some about some solutions (preferably multiple).