The smallest of our review models, the Steel Leather is part of the Electro-Harmonix Nano Series. Built within a diecast chassis its very tough and roadworthy and, although compact, it does a lot for something so small. What does it do? E-H says its the opposite of a compressor: it enhances and excites your sound to make it punch out in a mix. Practically, that means thinning out muddy lower midrange and exciting the top to make it cut, with added dynamics relative to your pick attack: its not just a tonal thing. When the effect level pot is set at zero the dry signal is unaffected, but theres loads of adjustment so its best to be cautious as this pedal is all about sensitivity and relies on the volume of your individual notes. The response control alters how the strings speak in relation to each other so if its set low, only the louder notes are effected. For a balanced sound turn this control up until you hear a more even effect.