The digital ground control system has a loop switcher and they also made a mixer for guitar. The mixer has 2 sections and can allow you to set it up for multiple source signals like multiple amps. You can then run some offects in series with the signal or put them in parallel. The problem would be it's not dynamic so you can't change the configuration with a simple button push. I like it a lot as it keeps everything pure. Note I don't do a lot of effects stacking or chaining YMMV.
Sean