Thank you very much for the answer! I have heard a number of people asking similar questions. Just so I am clear, in this example, the bass and guitar would be routed through the same amp when they are both on, right?
I believe Royal Blood is driving at least two separate amps so when the bass and guitar are on, two amps are bring used - one for each signal. When he kills the bass signal, only the guitar amp is being used and vice versa.
This post makes me think that the separate amp setup is not possible with the QC alone.