The Thulcandra Boost/Overdrive is a modified version of the Xotic Soul Driven, which was developed in collaboration with Allen Hinds. It is based on the AC Booster circuit with roots in the Tube Screamer family. The main difference between the two is that the Thulcandra replaces the DIP switch with a potentiometer for more precise control over the bass boost.

The Soul Driven features a gyrator-based bass boost stage that emphasizes the 125Hz frequency. It offers four bass boost settings: flat, +2.4dB, +3.6dB, and +6dB. This allows you to tailor the low-end response to your preference.

The “Mid Boost” control on the Thulcandra is similar to the Voice control on the Zendrive or the Bass knob on the Timmy. It adjusts the resistor in the R-C filter to ground from the op-amp clipping stage. This not only changes the bass cutoff frequency but also affects the overall gain ratio.

Overall, the Thulcandra Boost/Overdrive stays true to the original design of the Xotic Soul Driven, with the addition of a potentiometer for more precise bass control. It is a versatile and flexible overdrive pedal that can be used to shape your tone and add some mid-gain saturation to your sound.

Summary created by AI from the original source.