What Electro-Harmonix say:
The Signal Pad 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 colour-free circuit. Leave your amp's volume set high for overdrive, and use the Signal Pad 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 favourite old pedals.
Quick Specs
True bypass
Turn any single channel amp into a two channel setup
Switch from lead to rhythm on the fly
Use in front or after any effects to change the tone of that effect
Battery Powered LED / Optional US96DC-200BI power supply
Dimensions in inches: 2.75 (w) x 4.5 (l) x 2.1 (h)
Dimensions in mm: 70 (w) x 115 (l) x 54 (h)