I've been reading threads for about 2 hours now and I'm just a little confused. First of all, what does a DI box actually do? That might sound stoopid to people who use them but I really don't get it. (DI= Direct Input right?) Also, if I have a bass pod acting as a preamp do I need a DI box when rehersing/ playing live? Finally, if I have my boss pod hooked up to an amp and there's no PA involved then should I have a DI box between the pod and the amp? Or is a DI box just for use with a PA? Thanx.