There's one key word to any Tone Bender MKII circuit, and that word is "germanium." This limited version of the Rosie, clad in a 1/4lb of brushed copper plate has that in spades, featuring Tesla-branded germanium transistors that have been hand-matched to ensure the sweetest tone. This sweetness is only made possible by testing, combining and harnessing the potency of old germanium parts. The Tone Bender MKII has it, and the Custom Shop Rosie has it. Simple.