This is a really classic and common old car problem. I see it all the time but this is the first time it's started happening to my own car.
Basically when I first turn the car on, there's instantly a pretty horrific squealing that sounds belt-related, and develops to an even higher pitch as I pull out of my parking spot before cutting off as I straighten out and drive away.
Thereafter, there's just a slight squeak you can hear in the engine when it idles or I'm traveling at a low speed.
What could be the issue? I drive a 97 Subaru Legacy. The main belts are brand new.