To close the loop on this (pun intended) I discussed with the owner of SoundSculpture, maker of SwtichBlade GL and other cool products. Here is answer. Quick version is that the SBGL does not need any DI or ReAmp boxes to connect a guitar, a line level device such as the H9000 or a guitar amp FX loop. The SBGL does have some headroom bandwidth, which is completely manageable and only deters unsophisticated users. I guess what I’m thinking now is to have one FX Chain with IO set at -10dbV for the FX in front of the guitar preamp (form guitar) and and 3 FX chains set at +4dbU for line level coming from FX loops and other guitar preamps (TriAxis).
From Ken @ SoundSculpture