I've been self-teaching myself for about a year now, and my friend gave me his extra slide, though he didn't tell me how to use it.

When I got home, I tried learning how to use it, and soon enough figured it out. But I'm pretty sure there's some mistakes to how I use it since the sound isn't so great. Here's some of the problems:

When I'm on a fret, for some reason the note seems a bit lower than what it should be.

I get a ringing sound when I lift off the slide to hit open strings. (Is that supposed to happen?"

Also once in a while, I hear buzzes while playing.

Help!!! =)

Btw, I tried playing "In My Time of Dying" to try out the slide.