In terms of routing the possibilities are almost endless....
If set up with the 4cm with a dedicated preamp in the Insert, you can route any FX pre or post. The FX/preamp chains can also be varied in terms of series/parallel, not only global or per chain but also within each preset chain....
The FX are Lexicon-quality. There´s an analog section that contains OD/TS, Comp, Wah,... especially the Wahs (Vox and Cry-Baby types) are damn good.
There are some reviews on the www, mostly from when it came out in ´99 (!!!)
http://www.soundonsound.com/sos/mar99/articles/lexicon.htm
http://www.loopers-delight.com/tools/MPX-G2/LexiconMPX-G2_review.html
http://www.stecrecords.com/?Name=Lexicon%20MPX%20G2
There´s also some PC/MAC edit software:
http://miprosoft.com/mpxg2/
And don´t forget to RTFM!!!!
http://www.lexiconpro.com/en/products/mpx-g2
BTW, works best with the MPX-R1 floorboard.....
Cheers
Magnus