How Do I Reduce Hiss On Guitar Parts And Live Reordings?, Logic Express plug-ins Options

[Repo]

How do i reduce hiss on guitar parts and live reordings but still maintain quality sound?
Obviously it helps to have a quality recording in the first place but sometimes i need to take out the background hiss from other samples etc
Any suggestions would be gratefully appreciated on which are the best plug-ins from Logic Express 7.2 for this and how to tweek them effectively?

[mortalengines]

I have noticed that the hiss and hum I get is pretty dependent on quality of instrument cables and their length and by how many effects are in the chain. Sometimes it can also be a mere matter of turning 90 degrees away from the amp or my monitor. Using a gate that opens and closes quickly can often help where a signal may be a little noisy as well.

[Will2009]

yes, that's what ground loop interference will cause you to do , in order to quieten the instrument or equipment, there is something in the chain that needs to be grounded better,
to find exactly which one can be somewhat of an task, but a necessary one, especially if it's very noticeable in your music.. you can probably google " Ground Loop Interference "
and find out much more about it than I can tell you.. Good Luck!!