my sound is messed up?

k, so i plugged into the rear mic…and my sound wasnt loud enough, even at full…and i plugged into line in…it sounded fine, except a horrid feedback type sound…a high pitched squeal…anyone know how ot make it go away? im running it through my amp, and it just started this…idk what to do…

Check your operating system’s mixer settings, specially any advanced ones, or specific tools your soundcard uses. I usually start my troubleshooting that way.

Sounds to me like feedback, because you have sound coming out of your speakers, being picked up and sent back into the speakers again. You need to turn the gain down (or off) somewhere.

A clear description of what you plugged in to where would be a good start.

Richardash has it right, we need to know what you’re plugging in.