I haven't read the whole thread but I've come across something quite important (for me as a podhd500 user anyway).
Since I've had my POD HD500 I've always had trouble with noise and the noisegates not working properly with high gain patches.
For some reason either of the 2 noisegates didn't work well.
There was always a fade out of noise even if the release was set to zero.
I haven't found a solution for patches without the TS9 model.
But yesterday I was frustrated getting a good noiseless and properly gated sound and I tried the Tubescreamer model before the noisegate.
I usually put the noisegate first in the chain but now for the first time since I've owned the POD I got a properly gated sound.
So try it out!
Now my goal is to figure out a way to get a good sound without a TS model.
I don't know why this works so wel as opposed to without a tube screamer model.
I use the TS for tone and volume only so no gain applied.
My POD is not faulty, I've owned 2 and a friend of mine also owns one.
There were always noise issues even with input 2 set to variax albeit less noise.
The noise gate on podfarm seems to work really well and I thought they would use the same algorhythm but it sounds like crap.... (untill now with the TS thing)
Use a noise gate in your DAW.