The Lexicon MPX-G2 goes in 4cable-method with the Triaxis...most transparent (besides the Eventide Eclipse and the AxeFx) unit I´ve come across so far....makes the TC G-Major (and in parts the G-Force) sound like a Pod 2.0 ;-)
MPX-G2 lets you adjust routing to your tastes....series, parallel, fx-order....
The Digitech GSP1101 also goes in 4cable-method with the MP-1. Also cuz I like to have certain FX (Wah, OD, Comp, Flanger, Phaser) before the Preamp and others after/in the loop. The Xpression is actually not in the GSP1101/ADA chain, it´s hooked to a Fishman Aura for Accoustic and Piezo stuff, in the MIDI chain however...