When I typed in 'alsamixer', it showed all my volume controls and stuff and I could lower/raise the volume.

But then I did 'alsamixer -c2' and it showed my USB microphone.

I did 'alsamixer' again after that, and now it says "alsamixer: function snd_ctl_open failed for default: No such file or directory".

How do I make it go back to the way it originally was before I put in my USB microphone? I tried taking it out but it's still doing the same thing