I might be buying some cheap ass bass off a friend, and I am wanting to do some research into it... I will tell you what it is, but I don't want people telling me I should fork out for a more expensive one, because I just wanna fuck around with it, then maybe later get a better one... it's a Samick or something, 4 strings... and... thats all I know about it... anyway, if someone could answer these questions that would be great... 
It has 3 turning knobs things, I guess one is volume, and one is tone (what does that do?) and another that appears to do nothing at all. So whats up with them?
And that Anesthesia (Pulling Teeth) song by Metallica shows a very distorted sorta sound (if I have the right mp3...) which I couldn't get on this bass when I tested it out... like a really messy reverb or what not... I want that... but I take it it's not a normal mode on a normal bass?
Just any info on how the bass works and what things do will be very helpful.
Thanks.
(As you can well see, I know not much about these new fangled electic instuments...)

It has 3 turning knobs things, I guess one is volume, and one is tone (what does that do?) and another that appears to do nothing at all. So whats up with them?
And that Anesthesia (Pulling Teeth) song by Metallica shows a very distorted sorta sound (if I have the right mp3...) which I couldn't get on this bass when I tested it out... like a really messy reverb or what not... I want that... but I take it it's not a normal mode on a normal bass?
Just any info on how the bass works and what things do will be very helpful.
Thanks.
(As you can well see, I know not much about these new fangled electic instuments...)