Ok.... try this.
You said you were using Nuendo... this will work if you are using Nuendo 4.
Download the attached zip. Drag the "guitar stuff" folder to your VSTplugins folder (freeware - no cracks, no viruses).
Then... import the track archive with all 3 tracks. I only used the free plug-in for one setting. Everything else is stock nuendo.
I have tons of these, but I am only giving up 3.
Gtr 1 is kind of a pushed clean thing.
Gtr 2 is a marshall... and can be almost any marshal.. try turning off the SD-1 for a clean ac/dc type thing, and try varying the gain on the amp sim for different effects.
Gtr 3 I think is kind like a Soldano.... maybe a Mesa...
Either copy the track settings to your guitar tracks... or just drag the DI onto this track to check it out. I have no idea what kind of music you are working on... so I just gave you a few I use when writing....
EQ to your taste... When in a mix... I have fooled many a great ear with these...