The Bass Chief is an op amp-based distortion pedal specifically designed for bass instruments, however you can use it for guitar if you wish. The pedal buffers and splits the incoming signal, one half is distorted by the amount set by the Gain control which is then further shaped by the Bass and Treble controls. The two signal paths meet again at the Blend control allowing the original signal to be mixed with the distorted version. Note that at extreme settings of the tone controls a further range of tones can be found using the Blend control to cancel parts of the original signal. The overall level of the combined signals can be arrived at by using the Volume control.