Actually since he using the 4 cable method, that would mean it will be bypassing the preamp thus using only the power amp. The vox poweramp section is actually a hybrid ss/valve so it might add a lot of warmth to the sound which I think might show very very good results. Adding more realism to the models in the GT8. I might also point that the vox amp is quite transparent, so it might help bring out more character from the GT8.

**Never tried 4 cable method with the vox b4, because in the vt series only 100 watter has effects loop, the VTXL lower watter models have effects loop.