No problem tomg, once you play around with it, you'll see its simple to do.
However it would be best to try and find the source of the hiss instead if covering it, did you notice how it changes the tone of the guitar in my post? I'm no expert, but I would start by checking connections{be sure their tight} then cables{remove/replace one at a time}. Rockerbob even mentioned how the pc fan can cause hiss, this is something I need to look into more myself. Covering should be a last resort.
These last couple of recordings you've posted have sure sounded better in the vocal department.
Heres some more on hiss...
How do I get rid of Hisssssssssss