Right now i guess the Direct Input wav files are copies of the same 'normal' ones, only the levels are set some -18db lower. Am i right?
Therefor it would not make any sense to 'push' their low levels up, thereby increasing the noise floor too. -F
Look at it this way. Take a solid body guitar, play it through a couple of effects and an amp and record it with a mic in front of the amp. That is a "wet" RT. Now unplug the solid body guitar, that is no effects or amp, and record it with the same mic in front of it. It will be a lot quieter. That is a "dry" RT.
The idea behind this is that you take the "dry" RT and play it through
your amp and effects. These can be software emulations or through hardware effects and amp.
I hope this helped.