Hi Sly Ruby,
I too am always looking at better ways of getting great vocals. I also have the VLP GTX. This has been the best tool I have found so far. I have used BIAB to create backing tracks and run a line out from my PC into the aux input. No need for a mixer. The big challenge for me is getting the sound levels similar through each song.

I have also tried to use recording software for vocal effects. I have used a program called Auria which is recording software for the iPad. It works okay for this purpose. I put myself in channels one and two and others tracks created from BIAB (then moved to Realband to separate the tracks) in the rest of the channels (usually just bass, keys and drums).

What I like is hitting the record button and playing a song through sound check. I then hit play and walk the room to listen and adjust the levels of each track. Once I get them like I want them, it is saved and my live mixes sound much better and can be different in each song. I am using all my own equipment so I have to be my own sound guy. Oh yes, forgot to say my current interface for this is an Alesis IO dock. I still use my VLP GTX in dual mono and the Auria gives me the ability to further EQ my vocal and guitar.

I have heard great things about the fat channel processing from the Presonus VSL. I believe this will be my next purchase since it serves two purposes for me - (1) better live vocals and (2) recording interface for Realband. I will probably go with the 44 since I often play along with a friend. Gives me four inputs on the front for two guitars and two vocals.

No matter which path I take, I will stick with the VLP GTX. This is a simple tool that never fails for me.