The EHX Signal Pad is a true bypass passive attenuator that allows you to change your amps volume to a preset level with just a click of the footswitch.  It's a simple concept with a very practical use and at a very attractive price! 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.