For this custom pedal Tall Font Russian, no mods needed, with a foot-switch that adds an extra gain stage when things need to go, “To eleven”, in the words of Nigel Tufnel. The added gain stage can be used independently, for a slightly gritty clean-boost, or used to smash the Tall Font Side with even more wallop, allowing the XT volume to be used to vary the extra grind.
For many bass players, this may be the only tool you’ll ever need.