After producing the Sonic Boom for years we got a request to make the input capacitor switchable. This is the answer to that request--the Sonic Boom +. The SB+ gives you the exact same circuitry as the original with the addition of a switch to swap out the input capacitor from a high value to one of very low value. When the switch is in the "full" position, the pedal is a standard Sonic Boom. When the switch is placed in the "Hi!" position, the low end is cut and mids slightly boosted. This is to help on those dark amps of old time...Get one today and enjoy the switchable goodness!