http://lovepedal.com/pedals/OD_11.html
The OD Eleven's controls bring out the best in your amp's unique voice rather than turn it into something it's not. The Bass control adds thickness without affecting other frequencies while the Tone control takes care of the high end definition.
You'll also find a friendly amount of touch sensitive gain and a mighty dose of output with the OD eleven. Plus you can run the unit from 9 to 18 volts for different flavors of headroom.