Korpa 
Switches volume presets on the fly—go from rhythm to lead, clean to overdrive.
The Electro-Harmonix Nano Signal Pad Guitar Pedal is a passive attenuator that allows you to instantly switch to a different preset volume. It's like your guitar's volume knob with a fully passive and color-free circuit. Leave your amp's volume set high for overdrive, and use the Signal Pad Pedal to lower your level for a clean sound—then switch it off to kick in your amp's natural overdrive. You can also experiment with the Signal Pad anywhere in your effects chain—you'll bring out new tonal combinations from your favorite old pedals.
