Everything a multi-layered guitarist needs in their arsenal: a succulent and smooth shimmer swell pad on one path, and a shrieking shrill boost on another path that cuts through the mix like a Japanese ginsu knife! The best part is that there's a 4-way toggle switch at the start of the chain that allows the source signal to constantly flow, but the 1st and 4th switches toggle either the pad or the boost (or BOTH if you want the NUCLEAR option!). This allows the guitarist to cut the pad or boost, but results in the pad's trails to remain in the mix as the source signal never changes. Putting together this pedalboard has convinced me of the amazing utility of the Mod Duo. Special thanks to Gianfranco for the boost - I got it early on, but forget what he named it.