So, If you wanna make it more complicated
I am running my pedal like this. Bass into WD front end, tuner out on the WD to Subway+ in, Subway+ preamp out back into the WD aux in.
I can use the mute switches on the WD and the Subway+ to switch back and forth between the two preamps, or not. I can let both run at the same time. I have the Subway+ wiith more of a deep and slightly scooped setting, and the WD set up the opposite, brighter and more mid-forward. Using the Master on the + and the gain on the WD to blend the two together.