MI Audio Blues Pro v.3 Overdrive Guitar Effects Pedal Amazing 'plug-and-play' low/medium gain overdrive4 external control Gain &ndash; Improved bass response for less bass loss, a typical problem with TS type pedals.DC plug (boss style) for use wit Toggle switch to unleash the subtle 'fuzz mode 'The classic JRC4558D IC. Double the gain of a typical TS type of pedal.