Simply speaking, one could call this device a solo-booster. Activating it ushers a louder and more present guitar sound for your solos. In addition to boosting the volume you can also boost the high frequencies in 3 stages. To make the application more practical we"ve duplicated all the functions so as that you can adjust a second preset setting which you can activate with an individual footswitch. Controls include 2 x gain, 2 x frequency select, footswitch, and preset.