About the amp problem you've mentioned. I use the built-in amp simulators of my multieffect. It is after the distortion block so if this would be the problem, the noise frequencies shouldn't even get into the PC. The main problem is that the noise frequencies are right in the middle of the wah-boosted frequency range!
I checked up the "average" guitar amplifier frequency characteristics some time ago and I've experimented wth my SBlive to make an EQ setting similar to a guitar amp. I even got that jump at 5kHz, but you know, these SW EQs aren't perfect. And the built-in stuff in the multieffect isn't so sophisticated either...
About the last sentence, there are some things I don't really understand (my english - I'm not the best in the acoustic slang). What is a "pod and floor board"? Does it have to do something with common earthing? (I'm just guessing. ;) )
