Running FX chains to multiple amps with an isolated A/B box

[dannybuoy]

I want to experiment running a parallel chain to a guitar amp with different different pedals in each chain. I've been looking at A/B/Y boxes and was sold on the Radial Twin City as it offers transformer isolation, ground lift, and phase invert switches for the second amp, as I understand ground loops can be a problem in setups like this.

This is all well and good, but what if I split the signal at the start of the chain, then power the separate bass and guitar chains from the same non-isolated power supply? Would the common ground between the pedals for the bass and guitar side then re-introduce ground loops, undoing all the good work done by the Radial?

I do have an isolated supply btw in the form of a Cioks DC5, but I run a few splitters and a daisy chain from it. Just trying to plan in advance if this supply will be up to the job if I need to ensure all each fx chain is isolated from each other in terms of power!

[PinkMohawk]

I do something similar, the splitter I use being in the middle of my chains, with separate drives after it on each channel, and it works just fine for me, not had a single issue with it.